373664521 has 4 divisors (see below), whose sum is σ = 374741712. Its totient is φ = 372587332.

The previous prime is 373664491. The next prime is 373664563. The reversal of 373664521 is 125466373.

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 373664521 - 2²⁷ = 239446793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (373664581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538075 + ... + 538768.

It is an arithmetic number, because the mean of its divisors is an integer number (93685428).

Almost surely, 2^373664521 is an apocalyptic number.

It is an amenable number.

373664521 is a deficient number, since it is larger than the sum of its proper divisors (1077191).

373664521 is a wasteful number, since it uses less digits than its factorization.

373664521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077190.

The product of its digits is 90720, while the sum is 37.

The square root of 373664521 is about 19330.4040568220. The cubic root of 373664521 is about 720.2677251537.

The spelling of 373664521 in words is "three hundred seventy-three million, six hundred sixty-four thousand, five hundred twenty-one".