85860431 has 2 divisors, whose sum is σ = 85860432. Its totient is φ = 85860430.

The previous prime is 85860391. The next prime is 85860443. The reversal of 85860431 is 13406858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85860431 - 2²⁶ = 18751567 is a prime.

It is a super-2 number, since 2×85860431² = 14744027223011522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 85860391 and 85860400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85865431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42930215 + 42930216.

It is an arithmetic number, because the mean of its divisors is an integer number (42930216).

Almost surely, 2^85860431 is an apocalyptic number.

85860431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85860431 is an equidigital number, since it uses as much as digits as its factorization.

85860431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 85860431 is about 9266.0903837595. The cubic root of 85860431 is about 441.1615846840.

The spelling of 85860431 in words is "eighty-five million, eight hundred sixty thousand, four hundred thirty-one".