172338557 has 2 divisors, whose sum is σ = 172338558. Its totient is φ = 172338556.

The previous prime is 172338541. The next prime is 172338581. The reversal of 172338557 is 755833271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139688761 + 32649796 = 11819^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 172338557 - 2⁴ = 172338541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172338527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86169278 + 86169279.

It is an arithmetic number, because the mean of its divisors is an integer number (86169279).

Almost surely, 2^172338557 is an apocalyptic number.

It is an amenable number.

172338557 is a deficient number, since it is larger than the sum of its proper divisors (1).

172338557 is an equidigital number, since it uses as much as digits as its factorization.

172338557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 172338557 is about 13127.7780678986. The cubic root of 172338557 is about 556.4944243822.

The spelling of 172338557 in words is "one hundred seventy-two million, three hundred thirty-eight thousand, five hundred fifty-seven".