521135660 has 48 divisors (see below), whose sum is σ = 1109245536. Its totient is φ = 205642752.

The previous prime is 521135653. The next prime is 521135677. The reversal of 521135660 is 66531125.

It is a super-2 number, since 2×521135660² = 543164752247271200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661787 + ... + 662573.

It is an arithmetic number, because the mean of its divisors is an integer number (23109282).

Almost surely, 2^521135660 is an apocalyptic number.

It is an amenable number.

521135660 is an abundant number, since it is smaller than the sum of its proper divisors (588109876).

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

521135660 is a wasteful number, since it uses less digits than its factorization.

521135660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 521135660 is about 22828.3959138613. The cubic root of 521135660 is about 804.7301334260.

Adding to 521135660 its reverse (66531125), we get a palindrome (587666785).

The spelling of 521135660 in words is "five hundred twenty-one million, one hundred thirty-five thousand, six hundred sixty".