86551681 has 2 divisors, whose sum is σ = 86551682. Its totient is φ = 86551680.

The previous prime is 86551657. The next prime is 86551693. The reversal of 86551681 is 18615568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70711281 + 15840400 = 8409^2 + 3980^2 .

It is a cyclic number.

It is not a de Polignac number, because 86551681 - 2⁵ = 86551649 is a prime.

It is a super-2 number, since 2×86551681² = 14982386967851522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86551601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43275840 + 43275841.

It is an arithmetic number, because the mean of its divisors is an integer number (43275841).

Almost surely, 2^86551681 is an apocalyptic number.

It is an amenable number.

86551681 is a deficient number, since it is larger than the sum of its proper divisors (1).

86551681 is an equidigital number, since it uses as much as digits as its factorization.

86551681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 40.

The square root of 86551681 is about 9303.3155917662. The cubic root of 86551681 is about 442.3423311786.

The spelling of 86551681 in words is "eighty-six million, five hundred fifty-one thousand, six hundred eighty-one".