86785931 has 2 divisors, whose sum is σ = 86785932. Its totient is φ = 86785930.

The previous prime is 86785913. The next prime is 86785949. The reversal of 86785931 is 13958768.

It is a happy number.

Together with previous prime (86785913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (86785913) and next prime (86785949).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86785931 is a prime.

It is a super-2 number, since 2×86785931² = 15063595639073522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (86785961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43392965 + 43392966.

It is an arithmetic number, because the mean of its divisors is an integer number (43392966).

Almost surely, 2^86785931 is an apocalyptic number.

86785931 is a deficient number, since it is larger than the sum of its proper divisors (1).

86785931 is an equidigital number, since it uses as much as digits as its factorization.

86785931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 86785931 is about 9315.8966825529. The cubic root of 86785931 is about 442.7410345879.

The spelling of 86785931 in words is "eighty-six million, seven hundred eighty-five thousand, nine hundred thirty-one".