976668509 has 2 divisors, whose sum is σ = 976668510. Its totient is φ = 976668508.

The previous prime is 976668439. The next prime is 976668551. The reversal of 976668509 is 905866679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810825625 + 165842884 = 28475^2 + 12878^2 .

It is a cyclic number.

It is not a de Polignac number, because 976668509 - 2²⁰ = 975619933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (976668599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488334254 + 488334255.

It is an arithmetic number, because the mean of its divisors is an integer number (488334255).

Almost surely, 2^976668509 is an apocalyptic number.

It is an amenable number.

976668509 is a deficient number, since it is larger than the sum of its proper divisors (1).

976668509 is an equidigital number, since it uses as much as digits as its factorization.

976668509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 976668509 is about 31251.6960979720. The cubic root of 976668509 is about 992.1615556581.

The spelling of 976668509 in words is "nine hundred seventy-six million, six hundred sixty-eight thousand, five hundred nine".