1155111131 has 2 divisors, whose sum is σ = 1155111132. Its totient is φ = 1155111130.

The previous prime is 1155111091. The next prime is 1155111149. The reversal of 1155111131 is 1311115511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155111131 - 2¹⁸ = 1154848987 is a prime.

It is a super-2 number, since 2×1155111131² = 2668563449920198322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1155111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577555565 + 577555566.

It is an arithmetic number, because the mean of its divisors is an integer number (577555566).

Almost surely, 2^1155111131 is an apocalyptic number.

1155111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155111131 is an equidigital number, since it uses as much as digits as its factorization.

1155111131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75, while the sum is 20.

The square root of 1155111131 is about 33986.9258833452. The cubic root of 1155111131 is about 1049.2393980701.

Adding to 1155111131 its reverse (1311115511), we get a palindrome (2466226642).

The spelling of 1155111131 in words is "one billion, one hundred fifty-five million, one hundred eleven thousand, one hundred thirty-one".