523320731 has 4 divisors (see below), whose sum is σ = 523454712. Its totient is φ = 523186752.

The previous prime is 523320691. The next prime is 523320751. The reversal of 523320731 is 137023325.

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

It is a cyclic number.

It is not a de Polignac number, because 523320731 - 2¹⁰ = 523319707 is a prime.

It is a super-2 number, since 2×523320731² = 547729174988748722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 523320731.

It is not an unprimeable number, because it can be changed into a prime (523320751) 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, 60950 + ... + 69003.

It is an arithmetic number, because the mean of its divisors is an integer number (130863678).

Almost surely, 2^523320731 is an apocalyptic number.

523320731 is a deficient number, since it is larger than the sum of its proper divisors (133981).

523320731 is a wasteful number, since it uses less digits than its factorization.

523320731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133980.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 523320731 is about 22876.2044710218. The cubic root of 523320731 is about 805.8532834561.

The spelling of 523320731 in words is "five hundred twenty-three million, three hundred twenty thousand, seven hundred thirty-one".