990068931 has 12 divisors (see below), whose sum is σ = 1430382408. Its totient is φ = 659915424.

The previous prime is 990068923. The next prime is 990068939. The reversal of 990068931 is 139860099.

It is an interprime number because it is at equal distance from previous prime (990068923) and next prime (990068939).

It is not a de Polignac number, because 990068931 - 2³ = 990068923 is a prime.

It is a super-2 number, since 2×990068931² = 1960472976262965522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990068939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65056 + ... + 78818.

It is an arithmetic number, because the mean of its divisors is an integer number (119198534).

Almost surely, 2^990068931 is an apocalyptic number.

990068931 is a deficient number, since it is larger than the sum of its proper divisors (440313477).

990068931 is a wasteful number, since it uses less digits than its factorization.

990068931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21762 (or 21759 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 990068931 is about 31465.3608115337. The cubic root of 990068931 is about 996.6786243437.

The spelling of 990068931 in words is "nine hundred ninety million, sixty-eight thousand, nine hundred thirty-one".