521376223 has 4 divisors (see below), whose sum is σ = 521829568. Its totient is φ = 520922880.

The previous prime is 521376199. The next prime is 521376227. The reversal of 521376223 is 322673125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521376223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521376227) 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, 224943 + ... + 227248.

It is an arithmetic number, because the mean of its divisors is an integer number (130457392).

Almost surely, 2^521376223 is an apocalyptic number.

521376223 is a deficient number, since it is larger than the sum of its proper divisors (453345).

521376223 is a wasteful number, since it uses less digits than its factorization.

521376223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453344.

The product of its digits is 15120, while the sum is 31.

The square root of 521376223 is about 22833.6642482104. The cubic root of 521376223 is about 804.8539390106.

The spelling of 521376223 in words is "five hundred twenty-one million, three hundred seventy-six thousand, two hundred twenty-three".