86812681 has 2 divisors, whose sum is σ = 86812682. Its totient is φ = 86812680.

The previous prime is 86812651. The next prime is 86812697. The reversal of 86812681 is 18621868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86322681 + 490000 = 9291^2 + 700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86812681 is a prime.

It is a super-2 number, since 2×86812681² = 15072883164815522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86812651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43406340 + 43406341.

It is an arithmetic number, because the mean of its divisors is an integer number (43406341).

Almost surely, 2^86812681 is an apocalyptic number.

It is an amenable number.

86812681 is a deficient number, since it is larger than the sum of its proper divisors (1).

86812681 is an equidigital number, since it uses as much as digits as its factorization.

86812681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 40.

The square root of 86812681 is about 9317.3322898778. The cubic root of 86812681 is about 442.7865185580.

The spelling of 86812681 in words is "eighty-six million, eight hundred twelve thousand, six hundred eighty-one".