97777997 has 2 divisors, whose sum is σ = 97777998. Its totient is φ = 97777996.

The previous prime is 97777987. The next prime is 97778029. The reversal of 97777997 is 79977779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95628841 + 2149156 = 9779^2 + 1466^2 .

It is a cyclic number.

It is not a de Polignac number, because 97777997 - 2⁸ = 97777741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97777957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48888998 + 48888999.

It is an arithmetic number, because the mean of its divisors is an integer number (48888999).

Almost surely, 2^97777997 is an apocalyptic number.

It is an amenable number.

97777997 is a deficient number, since it is larger than the sum of its proper divisors (1).

97777997 is an equidigital number, since it uses as much as digits as its factorization.

97777997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12252303, while the sum is 62.

The square root of 97777997 is about 9888.2757344241. The cubic root of 97777997 is about 460.6952263001.

The spelling of 97777997 in words is "ninety-seven million, seven hundred seventy-seven thousand, nine hundred ninety-seven".