857172331 has 2 divisors, whose sum is σ = 857172332. Its totient is φ = 857172330.

The previous prime is 857172319. The next prime is 857172341. The reversal of 857172331 is 133271758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857172331 - 2⁵ = 857172299 is a prime.

It is a super-2 number, since 2×857172331² = 1469488810063947122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857172341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428586165 + 428586166.

It is an arithmetic number, because the mean of its divisors is an integer number (428586166).

Almost surely, 2^857172331 is an apocalyptic number.

857172331 is a deficient number, since it is larger than the sum of its proper divisors (1).

857172331 is an equidigital number, since it uses as much as digits as its factorization.

857172331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 857172331 is about 29277.5055460673. The cubic root of 857172331 is about 949.9251394381.

The spelling of 857172331 in words is "eight hundred fifty-seven million, one hundred seventy-two thousand, three hundred thirty-one".