285625931 has 2 divisors, whose sum is σ = 285625932. Its totient is φ = 285625930.

The previous prime is 285625913. The next prime is 285625933. The reversal of 285625931 is 139526582.

Together with previous prime (285625913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285625931 - 2⁶ = 285625867 is a prime.

It is a super-2 number, since 2×285625931² = 163164344919233522, which contains 22 as substring.

Together with 285625933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285625933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142812965 + 142812966.

It is an arithmetic number, because the mean of its divisors is an integer number (142812966).

Almost surely, 2^285625931 is an apocalyptic number.

285625931 is a deficient number, since it is larger than the sum of its proper divisors (1).

285625931 is an equidigital number, since it uses as much as digits as its factorization.

285625931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 285625931 is about 16900.4713247885. The cubic root of 285625931 is about 658.5658567119.

The spelling of 285625931 in words is "two hundred eighty-five million, six hundred twenty-five thousand, nine hundred thirty-one".