521311020 has 48 divisors (see below), whose sum is σ = 1484421120. Its totient is φ = 136659136.

The previous prime is 521310983. The next prime is 521311027. The reversal of 521311020 is 20113125.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (521311027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70092 + ... + 77171.

It is an arithmetic number, because the mean of its divisors is an integer number (30925440).

Almost surely, 2^521311020 is an apocalyptic number.

It is an amenable number.

521311020 is an abundant number, since it is smaller than the sum of its proper divisors (963110100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521311020 is a wasteful number, since it uses less digits than its factorization.

521311020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147334 (or 147332 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 521311020 is about 22832.2364213408. The cubic root of 521311020 is about 804.8203860937.

Adding to 521311020 its reverse (20113125), we get a palindrome (541424145).

The spelling of 521311020 in words is "five hundred twenty-one million, three hundred eleven thousand, twenty".