976789661 has 2 divisors, whose sum is σ = 976789662. Its totient is φ = 976789660.

The previous prime is 976789613. The next prime is 976789669. The reversal of 976789661 is 166987679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560221561 + 416568100 = 23669^2 + 20410^2 .

It is an emirp because it is prime and its reverse (166987679) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-976789661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 976789661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (976789669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488394830 + 488394831.

It is an arithmetic number, because the mean of its divisors is an integer number (488394831).

Almost surely, 2^976789661 is an apocalyptic number.

It is an amenable number.

976789661 is a deficient number, since it is larger than the sum of its proper divisors (1).

976789661 is an equidigital number, since it uses as much as digits as its factorization.

976789661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 976789661 is about 31253.6343646623. The cubic root of 976789661 is about 992.2025785797.

The spelling of 976789661 in words is "nine hundred seventy-six million, seven hundred eighty-nine thousand, six hundred sixty-one".