521545122 has 96 divisors (see below), whose sum is σ = 1374019200. Its totient is φ = 146162016.

The previous prime is 521545111. The next prime is 521545139. The reversal of 521545122 is 221545125.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138379 + ... + 142097.

It is an arithmetic number, because the mean of its divisors is an integer number (14312700).

Almost surely, 2^521545122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521545122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687009600).

521545122 is an abundant number, since it is smaller than the sum of its proper divisors (852474078).

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

521545122 is a wasteful number, since it uses less digits than its factorization.

521545122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797 (or 3784 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 521545122 is about 22837.3624133787. The cubic root of 521545122 is about 804.9408400128.

The spelling of 521545122 in words is "five hundred twenty-one million, five hundred forty-five thousand, one hundred twenty-two".