1131311791 has 2 divisors, whose sum is σ = 1131311792. Its totient is φ = 1131311790.

The previous prime is 1131311777. The next prime is 1131311803. The reversal of 1131311791 is 1971131311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131311791 - 2⁵ = 1131311759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131311711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565655895 + 565655896.

It is an arithmetic number, because the mean of its divisors is an integer number (565655896).

Almost surely, 2^1131311791 is an apocalyptic number.

1131311791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131311791 is an equidigital number, since it uses as much as digits as its factorization.

1131311791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 28.

The square root of 1131311791 is about 33634.9786829128. The cubic root of 1131311791 is about 1041.9833303650.

It can be divided in two parts, 11313 and 11791, that added together give a square (23104 = 152²).

The spelling of 1131311791 in words is "one billion, one hundred thirty-one million, three hundred eleven thousand, seven hundred ninety-one".