9990131 has 2 divisors, whose sum is σ = 9990132. Its totient is φ = 9990130.

The previous prime is 9990121. The next prime is 9990133. The reversal of 9990131 is 1310999.

It is a strong prime.

It is an emirp because it is prime and its reverse (1310999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990131 is a prime.

It is a super-2 number, since 2×9990131² = 199605434794322, which contains 22 as substring.

Together with 9990133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9990133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995065 + 4995066.

It is an arithmetic number, because the mean of its divisors is an integer number (4995066).

Almost surely, 2^9990131 is an apocalyptic number.

9990131 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990131 is an equidigital number, since it uses as much as digits as its factorization.

9990131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 9990131 is about 3160.7168490708. The cubic root of 9990131 is about 215.3725719555.

The spelling of 9990131 in words is "nine million, nine hundred ninety thousand, one hundred thirty-one".