97879777 has 2 divisors, whose sum is σ = 97879778. Its totient is φ = 97879776.

The previous prime is 97879759. The next prime is 97879799. The reversal of 97879777 is 77797879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90611361 + 7268416 = 9519^2 + 2696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97879777 is a prime.

It is not a weakly prime, because it can be changed into another prime (97879277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48939888 + 48939889.

It is an arithmetic number, because the mean of its divisors is an integer number (48939889).

Almost surely, 2^97879777 is an apocalyptic number.

It is an amenable number.

97879777 is a deficient number, since it is larger than the sum of its proper divisors (1).

97879777 is an equidigital number, since it uses as much as digits as its factorization.

97879777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10890936, while the sum is 61.

The square root of 97879777 is about 9893.4208947158. The cubic root of 97879777 is about 460.8550212826.

The spelling of 97879777 in words is "ninety-seven million, eight hundred seventy-nine thousand, seven hundred seventy-seven".