520503981 has 8 divisors (see below), whose sum is σ = 716392704. Its totient is φ = 335808960.

The previous prime is 520503967. The next prime is 520503983. The reversal of 520503981 is 189305025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520503981 - 2⁷ = 520503853 is a prime.

It is a super-2 number, since 2×520503981² = 541848788473696722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520503983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798316 + ... + 2798501.

It is an arithmetic number, because the mean of its divisors is an integer number (89549088).

Almost surely, 2^520503981 is an apocalyptic number.

It is an amenable number.

520503981 is a deficient number, since it is larger than the sum of its proper divisors (195888723).

520503981 is a wasteful number, since it uses less digits than its factorization.

520503981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596851.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 520503981 is about 22814.5563401965. The cubic root of 520503981 is about 804.4048587809.

The spelling of 520503981 in words is "five hundred twenty million, five hundred three thousand, nine hundred eighty-one".