97947977 has 2 divisors, whose sum is σ = 97947978. Its totient is φ = 97947976.

The previous prime is 97947973. The next prime is 97948049. The reversal of 97947977 is 77974979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97930816 + 17161 = 9896^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 97947977 - 2² = 97947973 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97947973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48973988 + 48973989.

It is an arithmetic number, because the mean of its divisors is an integer number (48973989).

Almost surely, 2^97947977 is an apocalyptic number.

It is an amenable number.

97947977 is a deficient number, since it is larger than the sum of its proper divisors (1).

97947977 is an equidigital number, since it uses as much as digits as its factorization.

97947977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7001316, while the sum is 59.

The square root of 97947977 is about 9896.8670295200. The cubic root of 97947977 is about 460.9620335661.

It can be divided in two parts, 9794 and 7977, that added together give a palindrome (17771).

The spelling of 97947977 in words is "ninety-seven million, nine hundred forty-seven thousand, nine hundred seventy-seven".