521012232 has 96 divisors (see below), whose sum is σ = 1526779800. Its totient is φ = 159556608.

The previous prime is 521012227. The next prime is 521012251. The reversal of 521012232 is 232210125.

It can be written as a sum of positive squares in 4 ways, for example, as 205807716 + 315204516 = 14346^2 + 17754^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216894 + ... + 219282.

Almost surely, 2^521012232 is an apocalyptic number.

521012232 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521012232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763389900).

521012232 is an abundant number, since it is smaller than the sum of its proper divisors (1005767568).

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

521012232 is a wasteful number, since it uses less digits than its factorization.

521012232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647 (or 2640 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 521012232 is about 22825.6923662788. The cubic root of 521012232 is about 804.6665965000. Note that the first 3 decimals are identical.

Adding to 521012232 its reverse (232210125), we get a palindrome (753222357).

The spelling of 521012232 in words is "five hundred twenty-one million, twelve thousand, two hundred thirty-two".