990492661 has 2 divisors, whose sum is σ = 990492662. Its totient is φ = 990492660.

The previous prime is 990492619. The next prime is 990492683. The reversal of 990492661 is 166294099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617771025 + 372721636 = 24855^2 + 19306^2 .

It is a cyclic number.

It is not a de Polignac number, because 990492661 - 2¹⁹ = 989968373 is a prime.

It is a super-2 number, since 2×990492661² = 1962151422989721842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990492611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495246330 + 495246331.

It is an arithmetic number, because the mean of its divisors is an integer number (495246331).

Almost surely, 2^990492661 is an apocalyptic number.

It is an amenable number.

990492661 is a deficient number, since it is larger than the sum of its proper divisors (1).

990492661 is an equidigital number, since it uses as much as digits as its factorization.

990492661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 990492661 is about 31472.0933685702. The cubic root of 990492661 is about 996.8207903371.

The spelling of 990492661 in words is "nine hundred ninety million, four hundred ninety-two thousand, six hundred sixty-one".