36565921 has 4 divisors (see below), whose sum is σ = 41789632. Its totient is φ = 31342212.

The previous prime is 36565889. The next prime is 36565951. The reversal of 36565921 is 12956563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36565921 - 2⁵ = 36565889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36565951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2611845 + ... + 2611858.

It is an arithmetic number, because the mean of its divisors is an integer number (10447408).

Almost surely, 2^36565921 is an apocalyptic number.

It is an amenable number.

36565921 is a deficient number, since it is larger than the sum of its proper divisors (5223711).

36565921 is an equidigital number, since it uses as much as digits as its factorization.

36565921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223710.

The product of its digits is 48600, while the sum is 37.

The square root of 36565921 is about 6046.9761864919. The cubic root of 36565921 is about 331.9139498525.

The spelling of 36565921 in words is "thirty-six million, five hundred sixty-five thousand, nine hundred twenty-one".