36921613 has 2 divisors, whose sum is σ = 36921614. Its totient is φ = 36921612.

The previous prime is 36921593. The next prime is 36921641. The reversal of 36921613 is 31612963.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35844169 + 1077444 = 5987^2 + 1038^2 .

It is a cyclic number.

It is not a de Polignac number, because 36921613 - 2⁵ = 36921581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36921673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18460806 + 18460807.

It is an arithmetic number, because the mean of its divisors is an integer number (18460807).

Almost surely, 2^36921613 is an apocalyptic number.

It is an amenable number.

36921613 is a deficient number, since it is larger than the sum of its proper divisors (1).

36921613 is an equidigital number, since it uses as much as digits as its factorization.

36921613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 36921613 is about 6076.3157422899. The cubic root of 36921613 is about 332.9867008850.

The spelling of 36921613 in words is "thirty-six million, nine hundred twenty-one thousand, six hundred thirteen".