976991 has 2 divisors, whose sum is σ = 976992. Its totient is φ = 976990.

The previous prime is 976957. The next prime is 977021. The reversal of 976991 is 199679.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (199679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 976991 - 2¹⁰ = 975967 is a prime.

It is a super-2 number, since 2×976991² = 1909022828162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (976951) 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, 488495 + 488496.

It is an arithmetic number, because the mean of its divisors is an integer number (488496).

2⁹⁷⁶⁹⁹¹ is an apocalyptic number.

976991 is a deficient number, since it is larger than the sum of its proper divisors (1).

976991 is an equidigital number, since it uses as much as digits as its factorization.

976991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 41.

The square root of 976991 is about 988.4285507815. The cubic root of 976991 is about 99.2270745883.

The spelling of 976991 in words is "nine hundred seventy-six thousand, nine hundred ninety-one".