990931588 has 6 divisors (see below), whose sum is σ = 1734130286. Its totient is φ = 495465792.

The previous prime is 990931577. The next prime is 990931589. The reversal of 990931588 is 885139099.

It can be written as a sum of positive squares in only one way, i.e., 983951424 + 6980164 = 31368^2 + 2642^2 .

It is not an unprimeable number, because it can be changed into a prime (990931589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123866445 + ... + 123866452.

Almost surely, 2^990931588 is an apocalyptic number.

It is an amenable number.

990931588 is a deficient number, since it is larger than the sum of its proper divisors (743198698).

990931588 is a wasteful number, since it uses less digits than its factorization.

990931588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247732901 (or 247732899 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 990931588 is about 31479.0658692408. The cubic root of 990931588 is about 996.9680123418.

The spelling of 990931588 in words is "nine hundred ninety million, nine hundred thirty-one thousand, five hundred eighty-eight".