99971057 has 2 divisors, whose sum is σ = 99971058. Its totient is φ = 99971056.

The previous prime is 99971051. The next prime is 99971083. The reversal of 99971057 is 75017999.

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., 93006736 + 6964321 = 9644^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 99971057 - 2⁶ = 99970993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99971051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49985528 + 49985529.

It is an arithmetic number, because the mean of its divisors is an integer number (49985529).

Almost surely, 2^99971057 is an apocalyptic number.

It is an amenable number.

99971057 is a deficient number, since it is larger than the sum of its proper divisors (1).

99971057 is an equidigital number, since it uses as much as digits as its factorization.

99971057 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 99971057 is about 9998.5527452727. The cubic root of 99971057 is about 464.1140985384.

The spelling of 99971057 in words is "ninety-nine million, nine hundred seventy-one thousand, fifty-seven".