36515005921 has 3 divisors (see below), whose sum is σ = 36515197011. Its totient is φ = 36514814832.

The previous prime is 36515005907. The next prime is 36515005937. The reversal of 36515005921 is 12950051563.

The square root of 36515005921 is 191089.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 33815164321 + 2699841600 = 183889^2 + 51960^2 .

It is not a de Polignac number, because 36515005921 - 2⁵ = 36515005889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36515005951) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 95545 + ... + 286633.

It is an arithmetic number, because the mean of its divisors is an integer number (12171732337).

Almost surely, 2^36515005921 is an apocalyptic number.

36515005921 is the 191089-th square number.

36515005921 is the 95545-th centered octagonal number.

It is an amenable number.

36515005921 is a deficient number, since it is larger than the sum of its proper divisors (191090).

36515005921 is an frugal number, since it uses more digits than its factorization.

36515005921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382178 (or 191089 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 37.

The spelling of 36515005921 in words is "thirty-six billion, five hundred fifteen million, five thousand, nine hundred twenty-one".