9906690491 has 6 divisors (see below), whose sum is σ = 10236570876. Its totient is φ = 9587118900.

The previous prime is 9906690473. The next prime is 9906690523. The reversal of 9906690491 is 1940966099.

It is a de Polignac number, because none of the positive numbers 2^k-9906690491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9906690401) 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 in 5 ways as a sum of consecutive naturals, for example, 5153405 + ... + 5155326.

It is an arithmetic number, because the mean of its divisors is an integer number (1706095146).

Almost surely, 2^9906690491 is an apocalyptic number.

9906690491 is a deficient number, since it is larger than the sum of its proper divisors (329880385).

9906690491 is a wasteful number, since it uses less digits than its factorization.

9906690491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308793 (or 10308762 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 9906690491 is about 99532.3590145436. The cubic root of 9906690491 is about 2147.7127643868.

The spelling of 9906690491 in words is "nine billion, nine hundred six million, six hundred ninety thousand, four hundred ninety-one".