86859515921 has 2 divisors, whose sum is σ = 86859515922. Its totient is φ = 86859515920.

The previous prime is 86859515917. The next prime is 86859515957. The reversal of 86859515921 is 12951595868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82463162896 + 4396353025 = 287164^2 + 66305^2 .

It is a cyclic number.

It is not a de Polignac number, because 86859515921 - 2² = 86859515917 is a prime.

It is not a weakly prime, because it can be changed into another prime (86859515321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43429757960 + 43429757961.

It is an arithmetic number, because the mean of its divisors is an integer number (43429757961).

Almost surely, 2^86859515921 is an apocalyptic number.

It is an amenable number.

86859515921 is a deficient number, since it is larger than the sum of its proper divisors (1).

86859515921 is an equidigital number, since it uses as much as digits as its factorization.

86859515921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776000, while the sum is 59.

The spelling of 86859515921 in words is "eighty-six billion, eight hundred fifty-nine million, five hundred fifteen thousand, nine hundred twenty-one".