1131311157 has 4 divisors (see below), whose sum is σ = 1508414880. Its totient is φ = 754207436.

The previous prime is 1131311099. The next prime is 1131311161. The reversal of 1131311157 is 7511131311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1131311157 - 2⁷ = 1131311029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131361157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188551857 + ... + 188551862.

It is an arithmetic number, because the mean of its divisors is an integer number (377103720).

Almost surely, 2^1131311157 is an apocalyptic number.

It is an amenable number.

1131311157 is a deficient number, since it is larger than the sum of its proper divisors (377103723).

1131311157 is an equidigital number, since it uses as much as digits as its factorization.

1131311157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377103722.

The product of its digits is 315, while the sum is 24.

The square root of 1131311157 is about 33634.9692581991. The cubic root of 1131311157 is about 1041.9831357186.

Adding to 1131311157 its reverse (7511131311), we get a palindrome (8642442468).

The spelling of 1131311157 in words is "one billion, one hundred thirty-one million, three hundred eleven thousand, one hundred fifty-seven".