86491637 has 2 divisors, whose sum is σ = 86491638. Its totient is φ = 86491636.

The previous prime is 86491589. The next prime is 86491651. The reversal of 86491637 is 73619468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86285521 + 206116 = 9289^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 86491637 - 2²⁶ = 19382773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86496637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43245818 + 43245819.

It is an arithmetic number, because the mean of its divisors is an integer number (43245819).

Almost surely, 2^86491637 is an apocalyptic number.

It is an amenable number.

86491637 is a deficient number, since it is larger than the sum of its proper divisors (1).

86491637 is an equidigital number, since it uses as much as digits as its factorization.

86491637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 86491637 is about 9300.0880103362. The cubic root of 86491637 is about 442.2400179445.

The spelling of 86491637 in words is "eighty-six million, four hundred ninety-one thousand, six hundred thirty-seven".