977789497 has 2 divisors, whose sum is σ = 977789498. Its totient is φ = 977789496.

The previous prime is 977789489. The next prime is 977789503. The reversal of 977789497 is 794987779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812307001 + 165482496 = 28501^2 + 12864^2 .

It is a cyclic number.

It is not a de Polignac number, because 977789497 - 2³ = 977789489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (977789437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488894748 + 488894749.

It is an arithmetic number, because the mean of its divisors is an integer number (488894749).

Almost surely, 2^977789497 is an apocalyptic number.

It is an amenable number.

977789497 is a deficient number, since it is larger than the sum of its proper divisors (1).

977789497 is an equidigital number, since it uses as much as digits as its factorization.

977789497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56010528, while the sum is 67.

The square root of 977789497 is about 31269.6257892543. The cubic root of 977789497 is about 992.5410006601.

The spelling of 977789497 in words is "nine hundred seventy-seven million, seven hundred eighty-nine thousand, four hundred ninety-seven".