9901694851 has 2 divisors, whose sum is σ = 9901694852. Its totient is φ = 9901694850.

The previous prime is 9901694819. The next prime is 9901694899. The reversal of 9901694851 is 1584961099.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9901694851 - 2⁵ = 9901694819 is a prime.

It is not a weakly prime, because it can be changed into another prime (9901694351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950847425 + 4950847426.

It is an arithmetic number, because the mean of its divisors is an integer number (4950847426).

Almost surely, 2^9901694851 is an apocalyptic number.

9901694851 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901694851 is an equidigital number, since it uses as much as digits as its factorization.

9901694851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 9901694851 is about 99507.2602929053. The cubic root of 9901694851 is about 2147.3516951418.

The spelling of 9901694851 in words is "nine billion, nine hundred one million, six hundred ninety-four thousand, eight hundred fifty-one".