1990885331 has 2 divisors, whose sum is σ = 1990885332. Its totient is φ = 1990885330.

The previous prime is 1990885301. The next prime is 1990885343. The reversal of 1990885331 is 1335880991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990885331 is a prime.

It is a super-2 number, since 2×1990885331² = 7927248802381959122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1990885301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995442665 + 995442666.

It is an arithmetic number, because the mean of its divisors is an integer number (995442666).

Almost surely, 2^1990885331 is an apocalyptic number.

1990885331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990885331 is an equidigital number, since it uses as much as digits as its factorization.

1990885331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1990885331 is about 44619.3380833916. The cubic root of 1990885331 is about 1258.0041744355.

The spelling of 1990885331 in words is "one billion, nine hundred ninety million, eight hundred eighty-five thousand, three hundred thirty-one".