520219981 has 4 divisors (see below), whose sum is σ = 547600000. Its totient is φ = 492839964.

The previous prime is 520219979. The next prime is 520220039. The reversal of 520219981 is 189912025.

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 520219981 - 2¹ = 520219979 is a prime.

It is a super-2 number, since 2×520219981² = 541257657263280722, 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 520219981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520249981) 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, 13689981 + ... + 13690018.

It is an arithmetic number, because the mean of its divisors is an integer number (136900000).

Almost surely, 2^520219981 is an apocalyptic number.

It is an amenable number.

520219981 is a deficient number, since it is larger than the sum of its proper divisors (27380019).

520219981 is a wasteful number, since it uses less digits than its factorization.

520219981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27380018.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 520219981 is about 22808.3313944707. The cubic root of 520219981 is about 804.2585310227.

The spelling of 520219981 in words is "five hundred twenty million, two hundred nineteen thousand, nine hundred eighty-one".