172057531 has 2 divisors, whose sum is σ = 172057532. Its totient is φ = 172057530.

The previous prime is 172057517. The next prime is 172057579. The reversal of 172057531 is 135750271.

172057531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172057531 - 2⁵ = 172057499 is a prime.

It is a super-2 number, since 2×172057531² = 59207587947631922, which contains 22 as substring.

It is equal to p_9611734 and since 172057531 and 9611734 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 172057493 and 172057502.

It is not a weakly prime, because it can be changed into another prime (172057591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86028765 + 86028766.

It is an arithmetic number, because the mean of its divisors is an integer number (86028766).

Almost surely, 2^172057531 is an apocalyptic number.

172057531 is a deficient number, since it is larger than the sum of its proper divisors (1).

172057531 is an equidigital number, since it uses as much as digits as its factorization.

172057531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 172057531 is about 13117.0702140379. The cubic root of 172057531 is about 556.1917749770.

The spelling of 172057531 in words is "one hundred seventy-two million, fifty-seven thousand, five hundred thirty-one".