97307891977 has 2 divisors, whose sum is σ = 97307891978. Its totient is φ = 97307891976.

The previous prime is 97307891971. The next prime is 97307892023. The reversal of 97307891977 is 77919870379.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82953216256 + 14354675721 = 288016^2 + 119811^2 .

It is a cyclic number.

It is not a de Polignac number, because 97307891977 - 2³ = 97307891969 is a prime.

It is not a weakly prime, because it can be changed into another prime (97307891971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48653945988 + 48653945989.

It is an arithmetic number, because the mean of its divisors is an integer number (48653945989).

Almost surely, 2^97307891977 is an apocalyptic number.

It is an amenable number.

97307891977 is a deficient number, since it is larger than the sum of its proper divisors (1).

97307891977 is an equidigital number, since it uses as much as digits as its factorization.

97307891977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42007896, while the sum is 67.

The spelling of 97307891977 in words is "ninety-seven billion, three hundred seven million, eight hundred ninety-one thousand, nine hundred seventy-seven".