521359490 has 16 divisors (see below), whose sum is σ = 940257720. Its totient is φ = 208141440.

The previous prime is 521359481. The next prime is 521359499. The reversal of 521359490 is 94953125.

It is an interprime number because it is at equal distance from previous prime (521359481) and next prime (521359499).

It can be written as a sum of positive squares in 4 ways, for example, as 449058481 + 72301009 = 21191^2 + 8503^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521359499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44825 + ... + 55244.

Almost surely, 2^521359490 is an apocalyptic number.

521359490 is a deficient number, since it is larger than the sum of its proper divisors (418898230).

521359490 is a wasteful number, since it uses less digits than its factorization.

521359490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100597.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 521359490 is about 22833.2978345223. The cubic root of 521359490 is about 804.8453286160.

The spelling of 521359490 in words is "five hundred twenty-one million, three hundred fifty-nine thousand, four hundred ninety".