85879831 has 2 divisors, whose sum is σ = 85879832. Its totient is φ = 85879830.

The previous prime is 85879819. The next prime is 85879841. The reversal of 85879831 is 13897858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85879831 - 2⁵ = 85879799 is a prime.

It is a super-2 number, since 2×85879831² = 14750690745177122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85879811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42939915 + 42939916.

It is an arithmetic number, because the mean of its divisors is an integer number (42939916).

Almost surely, 2^85879831 is an apocalyptic number.

85879831 is a deficient number, since it is larger than the sum of its proper divisors (1).

85879831 is an equidigital number, since it uses as much as digits as its factorization.

85879831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 85879831 is about 9267.1371523249. The cubic root of 85879831 is about 441.1948087203.

The spelling of 85879831 in words is "eighty-five million, eight hundred seventy-nine thousand, eight hundred thirty-one".