85969031 has 2 divisors, whose sum is σ = 85969032. Its totient is φ = 85969030.

The previous prime is 85969003. The next prime is 85969033. The reversal of 85969031 is 13096958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85969031 - 2²⁶ = 18860167 is a prime.

It is a super-2 number, since 2×85969031² = 14781348582157922, which contains 22 as substring.

Together with 85969033, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85969031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85969033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42984515 + 42984516.

It is an arithmetic number, because the mean of its divisors is an integer number (42984516).

Almost surely, 2^85969031 is an apocalyptic number.

85969031 is a deficient number, since it is larger than the sum of its proper divisors (1).

85969031 is an equidigital number, since it uses as much as digits as its factorization.

85969031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 85969031 is about 9271.9486085720. The cubic root of 85969031 is about 441.3475064258.

The spelling of 85969031 in words is "eighty-five million, nine hundred sixty-nine thousand, thirty-one".