172316531 has 2 divisors, whose sum is σ = 172316532. Its totient is φ = 172316530.

The previous prime is 172316527. The next prime is 172316537. The reversal of 172316531 is 135613271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172316531 - 2² = 172316527 is a prime.

It is a super-2 number, since 2×172316531² = 59385973711747922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 172316494 and 172316503.

It is not a weakly prime, because it can be changed into another prime (172316537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86158265 + 86158266.

It is an arithmetic number, because the mean of its divisors is an integer number (86158266).

Almost surely, 2^172316531 is an apocalyptic number.

172316531 is a deficient number, since it is larger than the sum of its proper divisors (1).

172316531 is an equidigital number, since it uses as much as digits as its factorization.

172316531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 172316531 is about 13126.9391329434. The cubic root of 172316531 is about 556.4707154907.

The spelling of 172316531 in words is "one hundred seventy-two million, three hundred sixteen thousand, five hundred thirty-one".