521370612 has 72 divisors (see below), whose sum is σ = 1525305600. Its totient is φ = 147071808.

The previous prime is 521370611. The next prime is 521370677. The reversal of 521370612 is 216073125.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521370611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6814 + ... + 33002.

It is an arithmetic number, because the mean of its divisors is an integer number (21184800).

Almost surely, 2^521370612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521370612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762652800).

521370612 is an abundant number, since it is smaller than the sum of its proper divisors (1003934988).

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

521370612 is a wasteful number, since it uses less digits than its factorization.

521370612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26285 (or 26280 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 521370612 is about 22833.5413810473. The cubic root of 521370612 is about 804.8510517470.

The spelling of 521370612 in words is "five hundred twenty-one million, three hundred seventy thousand, six hundred twelve".