990961 has 2 divisors, whose sum is σ = 990962. Its totient is φ = 990960.

The previous prime is 990953. The next prime is 990967. The reversal of 990961 is 169099.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 20736 = 985^2 + 144^2 .

It is a cyclic number.

It is not a de Polignac number, because 990961 - 2³ = 990953 is a prime.

It is not a weakly prime, because it can be changed into another prime (990967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495480 + 495481.

It is an arithmetic number, because the mean of its divisors is an integer number (495481).

2⁹⁹⁰⁹⁶¹ is an apocalyptic number.

It is an amenable number.

990961 is a deficient number, since it is larger than the sum of its proper divisors (1).

990961 is an equidigital number, since it uses as much as digits as its factorization.

990961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 990961 is about 995.4702406401. The cubic root of 990961 is about 99.6977875967.

The spelling of 990961 in words is "nine hundred ninety thousand, nine hundred sixty-one".