36311385581 has 2 divisors, whose sum is σ = 36311385582. Its totient is φ = 36311385580.

The previous prime is 36311385541. The next prime is 36311385613. The reversal of 36311385581 is 18558311363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26022529225 + 10288856356 = 161315^2 + 101434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36311385581 is a prime.

It is a super-2 number, since 2×36311385581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36311385511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18155692790 + 18155692791.

It is an arithmetic number, because the mean of its divisors is an integer number (18155692791).

Almost surely, 2^36311385581 is an apocalyptic number.

It is an amenable number.

36311385581 is a deficient number, since it is larger than the sum of its proper divisors (1).

36311385581 is an equidigital number, since it uses as much as digits as its factorization.

36311385581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The spelling of 36311385581 in words is "thirty-six billion, three hundred eleven million, three hundred eighty-five thousand, five hundred eighty-one".