990964657 has 2 divisors, whose sum is σ = 990964658. Its totient is φ = 990964656.

The previous prime is 990964651. The next prime is 990964699. The reversal of 990964657 is 756469099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718186401 + 272778256 = 26799^2 + 16516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990964657 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 990964598 and 990964607.

It is not a weakly prime, because it can be changed into another prime (990964651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495482328 + 495482329.

It is an arithmetic number, because the mean of its divisors is an integer number (495482329).

Almost surely, 2^990964657 is an apocalyptic number.

It is an amenable number.

990964657 is a deficient number, since it is larger than the sum of its proper divisors (1).

990964657 is an equidigital number, since it uses as much as digits as its factorization.

990964657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 990964657 is about 31479.5911186915. The cubic root of 990964657 is about 996.9791023669.

The spelling of 990964657 in words is "nine hundred ninety million, nine hundred sixty-four thousand, six hundred fifty-seven".