86521013 has 2 divisors, whose sum is σ = 86521014. Its totient is φ = 86521012.

The previous prime is 86520983. The next prime is 86521027. The reversal of 86521013 is 31012568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46553329 + 39967684 = 6823^2 + 6322^2 .

It is a cyclic number.

It is not a de Polignac number, because 86521013 - 2¹² = 86516917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86521033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43260506 + 43260507.

It is an arithmetic number, because the mean of its divisors is an integer number (43260507).

Almost surely, 2^86521013 is an apocalyptic number.

It is an amenable number.

86521013 is a deficient number, since it is larger than the sum of its proper divisors (1).

86521013 is an equidigital number, since it uses as much as digits as its factorization.

86521013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 86521013 is about 9301.6672161500. The cubic root of 86521013 is about 442.2900797105.

The spelling of 86521013 in words is "eighty-six million, five hundred twenty-one thousand, thirteen".