86321813 has 2 divisors, whose sum is σ = 86321814. Its totient is φ = 86321812.

The previous prime is 86321803. The next prime is 86321839. The reversal of 86321813 is 31812368.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83576164 + 2745649 = 9142^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 86321813 - 2⁶ = 86321749 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86321813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86321803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43160906 + 43160907.

It is an arithmetic number, because the mean of its divisors is an integer number (43160907).

Almost surely, 2^86321813 is an apocalyptic number.

It is an amenable number.

86321813 is a deficient number, since it is larger than the sum of its proper divisors (1).

86321813 is an equidigital number, since it uses as much as digits as its factorization.

86321813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 86321813 is about 9290.9532880109. The cubic root of 86321813 is about 441.9503861785.

The spelling of 86321813 in words is "eighty-six million, three hundred twenty-one thousand, eight hundred thirteen".