1131899231 has 2 divisors, whose sum is σ = 1131899232. Its totient is φ = 1131899230.

The previous prime is 1131899159. The next prime is 1131899233. The reversal of 1131899231 is 1329981311.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131899231 is a prime.

It is a super-2 number, since 2×1131899231² = 2562391738276782722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1131899233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131899233) 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 as a sum of consecutive naturals, namely, 565949615 + 565949616.

It is an arithmetic number, because the mean of its divisors is an integer number (565949616).

Almost surely, 2^1131899231 is an apocalyptic number.

1131899231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131899231 is an equidigital number, since it uses as much as digits as its factorization.

1131899231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 38.

The square root of 1131899231 is about 33643.7101253711. The cubic root of 1131899231 is about 1042.1636510562.

The spelling of 1131899231 in words is "one billion, one hundred thirty-one million, eight hundred ninety-nine thousand, two hundred thirty-one".