11988131 has 2 divisors, whose sum is σ = 11988132. Its totient is φ = 11988130.

The previous prime is 11988121. The next prime is 11988139. The reversal of 11988131 is 13188911.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11988131 is a prime.

It is a super-2 number, since 2×11988131² = 287430569746322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11988139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994065 + 5994066.

It is an arithmetic number, because the mean of its divisors is an integer number (5994066).

Almost surely, 2^11988131 is an apocalyptic number.

11988131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11988131 is an equidigital number, since it uses as much as digits as its factorization.

11988131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 32.

The square root of 11988131 is about 3462.3880487317. The cubic root of 11988131 is about 228.8673424260.

The spelling of 11988131 in words is "eleven million, nine hundred eighty-eight thousand, one hundred thirty-one".