97991057 has 2 divisors, whose sum is σ = 97991058. Its totient is φ = 97991056.

The previous prime is 97991021. The next prime is 97991119. The reversal of 97991057 is 75019979.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 9461776 = 9409^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 97991057 - 2⁶ = 97990993 is a prime.

It is not a weakly prime, because it can be changed into another prime (97991657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48995528 + 48995529.

It is an arithmetic number, because the mean of its divisors is an integer number (48995529).

Almost surely, 2^97991057 is an apocalyptic number.

It is an amenable number.

97991057 is a deficient number, since it is larger than the sum of its proper divisors (1).

97991057 is an equidigital number, since it uses as much as digits as its factorization.

97991057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 97991057 is about 9899.0432365962. The cubic root of 97991057 is about 461.0296045848.

The spelling of 97991057 in words is "ninety-seven million, nine hundred ninety-one thousand, fifty-seven".