9901691057 has 2 divisors, whose sum is σ = 9901691058. Its totient is φ = 9901691056.

The previous prime is 9901691053. The next prime is 9901691071. The reversal of 9901691057 is 7501961099.

9901691057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6056574976 + 3845116081 = 77824^2 + 62009^2 .

It is a cyclic number.

It is not a de Polignac number, because 9901691057 - 2² = 9901691053 is a prime.

It is not a weakly prime, because it can be changed into another prime (9901691053) 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, 4950845528 + 4950845529.

It is an arithmetic number, because the mean of its divisors is an integer number (4950845529).

Almost surely, 2^9901691057 is an apocalyptic number.

It is an amenable number.

9901691057 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901691057 is an equidigital number, since it uses as much as digits as its factorization.

9901691057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 9901691057 is about 99507.2412289679. The cubic root of 9901691057 is about 2147.3514208772.

The spelling of 9901691057 in words is "nine billion, nine hundred one million, six hundred ninety-one thousand, fifty-seven".