990521590 has 8 divisors (see below), whose sum is σ = 1782938880. Its totient is φ = 396208632.

The previous prime is 990521549. The next prime is 990521603. The reversal of 990521590 is 95125099.

990521590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×990521590² = 1962266040512256200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49526070 + ... + 49526089.

It is an arithmetic number, because the mean of its divisors is an integer number (222867360).

Almost surely, 2^990521590 is an apocalyptic number.

990521590 is a deficient number, since it is larger than the sum of its proper divisors (792417290).

990521590 is a wasteful number, since it uses less digits than its factorization.

990521590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99052166.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 990521590 is about 31472.5529628596. The cubic root of 990521590 is about 996.8304948505.

The spelling of 990521590 in words is "nine hundred ninety million, five hundred twenty-one thousand, five hundred ninety".