86931797 has 2 divisors, whose sum is σ = 86931798. Its totient is φ = 86931796.

The previous prime is 86931787. The next prime is 86931809. The reversal of 86931797 is 79713968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69072721 + 17859076 = 8311^2 + 4226^2 .

It is a cyclic number.

It is not a de Polignac number, because 86931797 - 2²⁰ = 85883221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86931787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43465898 + 43465899.

It is an arithmetic number, because the mean of its divisors is an integer number (43465899).

Almost surely, 2^86931797 is an apocalyptic number.

It is an amenable number.

86931797 is a deficient number, since it is larger than the sum of its proper divisors (1).

86931797 is an equidigital number, since it uses as much as digits as its factorization.

86931797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 86931797 is about 9323.7222717110. The cubic root of 86931797 is about 442.9889423428.

The spelling of 86931797 in words is "eighty-six million, nine hundred thirty-one thousand, seven hundred ninety-seven".