518921023 has 4 divisors (see below), whose sum is σ = 519005080. Its totient is φ = 518836968.

The previous prime is 518921017. The next prime is 518921047. The reversal of 518921023 is 320129815.

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 518921023 - 2⁹ = 518920511 is a prime.

It is a super-2 number, since 2×518921023² = 538558056222733058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518921093) 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, 31965 + ... + 45382.

It is an arithmetic number, because the mean of its divisors is an integer number (129751270).

Almost surely, 2^518921023 is an apocalyptic number.

518921023 is a deficient number, since it is larger than the sum of its proper divisors (84057).

518921023 is an equidigital number, since it uses as much as digits as its factorization.

518921023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84056.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 518921023 is about 22779.8380810751. The cubic root of 518921023 is about 803.5885780443.

The spelling of 518921023 in words is "five hundred eighteen million, nine hundred twenty-one thousand, twenty-three".