9918131 has 2 divisors, whose sum is σ = 9918132. Its totient is φ = 9918130.

The previous prime is 9918127. The next prime is 9918137. The reversal of 9918131 is 1318199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9918131 - 2² = 9918127 is a prime.

It is a super-2 number, since 2×9918131² = 196738645066322, which contains 22 as substring.

It is equal to p₆₅₉₅₆₁ and since 9918131 and 659561 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (9918137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959065 + 4959066.

It is an arithmetic number, because the mean of its divisors is an integer number (4959066).

Almost surely, 2^9918131 is an apocalyptic number.

9918131 is a deficient number, since it is larger than the sum of its proper divisors (1).

9918131 is an equidigital number, since it uses as much as digits as its factorization.

9918131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The square root of 9918131 is about 3149.3064315814. The cubic root of 9918131 is about 214.8539191568.

The spelling of 9918131 in words is "nine million, nine hundred eighteen thousand, one hundred thirty-one".