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23172231 = 321136607
BaseRepresentation
bin101100001100…
…1010010000111
31121121021022210
41120121102013
521413002411
62144354503
7400650345
oct130312207
947537283
1023172231
1112097705
127915a33
134a542a4
143112995
15207aca6
hex1619487

23172231 has 8 divisors (see below), whose sum is σ = 31043584. Its totient is φ = 15374520.

The previous prime is 23172223. The next prime is 23172239. The reversal of 23172231 is 13227132.

It is an interprime number because it is at equal distance from previous prime (23172223) and next prime (23172239).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23172231 - 23 = 23172223 is a prime.

It is a super-2 number, since 2×231722312 = 1073904579034722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23172198 and 23172207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17671 + ... + 18936.

It is an arithmetic number, because the mean of its divisors is an integer number (3880448).

Almost surely, 223172231 is an apocalyptic number.

23172231 is a deficient number, since it is larger than the sum of its proper divisors (7871353).

23172231 is a wasteful number, since it uses less digits than its factorization.

23172231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36821.

The product of its digits is 504, while the sum is 21.

The square root of 23172231 is about 4813.7543560095. The cubic root of 23172231 is about 285.0947914912.

Adding to 23172231 its reverse (13227132), we get a palindrome (36399363).

The spelling of 23172231 in words is "twenty-three million, one hundred seventy-two thousand, two hundred thirty-one".

Divisors: 1 3 211 633 36607 109821 7724077 23172231