990761 has 2 divisors, whose sum is σ = 990762. Its totient is φ = 990760.

The previous prime is 990733. The next prime is 990767. The reversal of 990761 is 167099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 59536 = 965^2 + 244^2 .

It is an emirp because it is prime and its reverse (167099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990761 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990761.

It is not a weakly prime, because it can be changed into another prime (990767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495380 + 495381.

It is an arithmetic number, because the mean of its divisors is an integer number (495381).

2⁹⁹⁰⁷⁶¹ is an apocalyptic number.

It is an amenable number.

990761 is a deficient number, since it is larger than the sum of its proper divisors (1).

990761 is an equidigital number, since it uses as much as digits as its factorization.

990761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 990761 is about 995.3697805338. The cubic root of 990761 is about 99.6910800004.

The spelling of 990761 in words is "nine hundred ninety thousand, seven hundred sixty-one".