9901691056 has 10 divisors (see below), whose sum is σ = 19184526452. Its totient is φ = 4950845520.

The previous prime is 9901691053. The next prime is 9901691057. The reversal of 9901691056 is 6501961099.

It is a junction number, because it is equal to n+sod(n) for n = 9901690997 and 9901691015.

It is not an unprimeable number, because it can be changed into a prime (9901691053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309427830 + ... + 309427861.

Almost surely, 2^9901691056 is an apocalyptic number.

It is an amenable number.

9901691056 is a deficient number, since it is larger than the sum of its proper divisors (9282835396).

9901691056 is a wasteful number, since it uses less digits than its factorization.

9901691056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618855699 (or 618855693 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 9901691056 is about 99507.2412239431. The cubic root of 9901691056 is about 2147.3514208049.

The spelling of 9901691056 in words is "nine billion, nine hundred one million, six hundred ninety-one thousand, fifty-six".