977690691 has 6 divisors (see below), whose sum is σ = 1412219900. Its totient is φ = 651793788.

The previous prime is 977690677. The next prime is 977690713. The reversal of 977690691 is 196096779.

It is not a de Polignac number, because 977690691 - 2⁷ = 977690563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977690641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54316141 + ... + 54316158.

Almost surely, 2^977690691 is an apocalyptic number.

977690691 is a deficient number, since it is larger than the sum of its proper divisors (434529209).

977690691 is a wasteful number, since it uses less digits than its factorization.

977690691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108632305 (or 108632302 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The square root of 977690691 is about 31268.0458455593. The cubic root of 977690691 is about 992.5075673190.

The spelling of 977690691 in words is "nine hundred seventy-seven million, six hundred ninety thousand, six hundred ninety-one".