86689831 has 2 divisors, whose sum is σ = 86689832. Its totient is φ = 86689830.

The previous prime is 86689789. The next prime is 86689891. The reversal of 86689831 is 13898668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86689831 - 2²¹ = 84592679 is a prime.

It is a super-2 number, since 2×86689831² = 15030253597617122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86689891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43344915 + 43344916.

It is an arithmetic number, because the mean of its divisors is an integer number (43344916).

Almost surely, 2^86689831 is an apocalyptic number.

86689831 is a deficient number, since it is larger than the sum of its proper divisors (1).

86689831 is an equidigital number, since it uses as much as digits as its factorization.

86689831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 86689831 is about 9310.7374036647. The cubic root of 86689831 is about 442.5775552191.

The spelling of 86689831 in words is "eighty-six million, six hundred eighty-nine thousand, eight hundred thirty-one".