521499690 has 48 divisors (see below), whose sum is σ = 1357244928. Its totient is φ = 138928608.

The previous prime is 521499661. The next prime is 521499691. The reversal of 521499690 is 96994125.

It is a super-2 number, since 2×521499690² = 543923853340192200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521499691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115047 + ... + 119493.

It is an arithmetic number, because the mean of its divisors is an integer number (28275936).

Almost surely, 2^521499690 is an apocalyptic number.

521499690 is an abundant number, since it is smaller than the sum of its proper divisors (835745238).

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

521499690 is a wasteful number, since it uses less digits than its factorization.

521499690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763 (or 5760 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 521499690 is about 22836.3677059203. The cubic root of 521499690 is about 804.9174664301.

The spelling of 521499690 in words is "five hundred twenty-one million, four hundred ninety-nine thousand, six hundred ninety".