9901691047 has 2 divisors, whose sum is σ = 9901691048. Its totient is φ = 9901691046.

The previous prime is 9901690979. The next prime is 9901691053. The reversal of 9901691047 is 7401961099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9901691047 - 2¹¹ = 9901688999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9901690988 and 9901691006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9901691057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950845523 + 4950845524.

It is an arithmetic number, because the mean of its divisors is an integer number (4950845524).

Almost surely, 2^9901691047 is an apocalyptic number.

9901691047 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901691047 is an equidigital number, since it uses as much as digits as its factorization.

9901691047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 9901691047 is about 99507.2411787203. The cubic root of 9901691047 is about 2147.3514201543.

The spelling of 9901691047 in words is "nine billion, nine hundred one million, six hundred ninety-one thousand, forty-seven".