11131999 has 2 divisors, whose sum is σ = 11132000. Its totient is φ = 11131998.

The previous prime is 11131979. The next prime is 11132003. The reversal of 11131999 is 99913111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11131999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565999 + 5566000.

It is an arithmetic number, because the mean of its divisors is an integer number (5566000).

Almost surely, 2^11131999 is an apocalyptic number.

11131999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131999 is an equidigital number, since it uses as much as digits as its factorization.

11131999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 34.

The square root of 11131999 is about 3336.4650455235. The cubic root of 11131999 is about 223.2840595734.

The spelling of 11131999 in words is "eleven million, one hundred thirty-one thousand, nine hundred ninety-nine".