85257331 has 2 divisors, whose sum is σ = 85257332. Its totient is φ = 85257330.

The previous prime is 85257317. The next prime is 85257373. The reversal of 85257331 is 13375258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85257331 - 2⁷ = 85257203 is a prime.

It is a super-2 number, since 2×85257331² = 14537624978487122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85257311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42628665 + 42628666.

It is an arithmetic number, because the mean of its divisors is an integer number (42628666).

Almost surely, 2^85257331 is an apocalyptic number.

85257331 is a deficient number, since it is larger than the sum of its proper divisors (1).

85257331 is an equidigital number, since it uses as much as digits as its factorization.

85257331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 85257331 is about 9233.4896436829. The cubic root of 85257331 is about 440.1262223961.

The spelling of 85257331 in words is "eighty-five million, two hundred fifty-seven thousand, three hundred thirty-one".