977639693 has 2 divisors, whose sum is σ = 977639694. Its totient is φ = 977639692.

The previous prime is 977639657. The next prime is 977639731. The reversal of 977639693 is 396936779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811281289 + 166358404 = 28483^2 + 12898^2 .

It is a cyclic number.

It is not a de Polignac number, because 977639693 - 2¹² = 977635597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977639293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488819846 + 488819847.

It is an arithmetic number, because the mean of its divisors is an integer number (488819847).

Almost surely, 2^977639693 is an apocalyptic number.

It is an amenable number.

977639693 is a deficient number, since it is larger than the sum of its proper divisors (1).

977639693 is an equidigital number, since it uses as much as digits as its factorization.

977639693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11573604, while the sum is 59.

The square root of 977639693 is about 31267.2303378473. The cubic root of 977639693 is about 992.4903100611.

The spelling of 977639693 in words is "nine hundred seventy-seven million, six hundred thirty-nine thousand, six hundred ninety-three".