86637997 has 2 divisors, whose sum is σ = 86637998. Its totient is φ = 86637996.

The previous prime is 86637983. The next prime is 86638037. The reversal of 86637997 is 79973668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85266756 + 1371241 = 9234^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 86637997 - 2²³ = 78249389 is a prime.

It is a super-2 number, since 2×86637997² = 15012285048344018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86637917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43318998 + 43318999.

It is an arithmetic number, because the mean of its divisors is an integer number (43318999).

Almost surely, 2^86637997 is an apocalyptic number.

It is an amenable number.

86637997 is a deficient number, since it is larger than the sum of its proper divisors (1).

86637997 is an equidigital number, since it uses as much as digits as its factorization.

86637997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 86637997 is about 9307.9534270429. The cubic root of 86637997 is about 442.4893282668.

The spelling of 86637997 in words is "eighty-six million, six hundred thirty-seven thousand, nine hundred ninety-seven".