172117237 has 2 divisors, whose sum is σ = 172117238. Its totient is φ = 172117236.

The previous prime is 172117217. The next prime is 172117241. The reversal of 172117237 is 732711271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135466321 + 36650916 = 11639^2 + 6054^2 .

It is a cyclic number.

It is not a de Polignac number, because 172117237 - 2⁷ = 172117109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172117199 and 172117208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172117217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86058618 + 86058619.

It is an arithmetic number, because the mean of its divisors is an integer number (86058619).

Almost surely, 2^172117237 is an apocalyptic number.

It is an amenable number.

172117237 is a deficient number, since it is larger than the sum of its proper divisors (1).

172117237 is an equidigital number, since it uses as much as digits as its factorization.

172117237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4116, while the sum is 31.

The square root of 172117237 is about 13119.3459059513. The cubic root of 172117237 is about 556.2561025800.

The spelling of 172117237 in words is "one hundred seventy-two million, one hundred seventeen thousand, two hundred thirty-seven".