172223557 has 32 divisors (see below), whose sum is σ = 201129984. Its totient is φ = 146059200.

The previous prime is 172223551. The next prime is 172223561. The reversal of 172223557 is 755322271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172223557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172223551) 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 in 31 ways as a sum of consecutive naturals, for example, 1356028 + ... + 1356154.

It is an arithmetic number, because the mean of its divisors is an integer number (6285312).

Almost surely, 2^172223557 is an apocalyptic number.

It is an amenable number.

172223557 is a deficient number, since it is larger than the sum of its proper divisors (28906427).

172223557 is a wasteful number, since it uses less digits than its factorization.

172223557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its digits is 29400, while the sum is 34.

The square root of 172223557 is about 13123.3973116720. The cubic root of 172223557 is about 556.3706155645.

It can be divided in two parts, 172 and 223557, that added together give a square (223729 = 473²).

The spelling of 172223557 in words is "one hundred seventy-two million, two hundred twenty-three thousand, five hundred fifty-seven".