1131245031 has 16 divisors (see below), whose sum is σ = 1736388864. Its totient is φ = 641705664.

The previous prime is 1131244999. The next prime is 1131245033. The reversal of 1131245031 is 1305421311.

It is not a de Polignac number, because 1131245031 - 2⁵ = 1131244999 is a prime.

It is a super-2 number, since 2×1131245031² = 2559430640324381922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1131244989 and 1131245007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131245033) 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 in 15 ways as a sum of consecutive naturals, for example, 193725 + ... + 199478.

It is an arithmetic number, because the mean of its divisors is an integer number (108524304).

Almost surely, 2^1131245031 is an apocalyptic number.

1131245031 is a deficient number, since it is larger than the sum of its proper divisors (605143833).

1131245031 is a wasteful number, since it uses less digits than its factorization.

1131245031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393350.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1131245031 is about 33633.9862490309. The cubic root of 1131245031 is about 1041.9628337533.

Adding to 1131245031 its reverse (1305421311), we get a palindrome (2436666342).

The spelling of 1131245031 in words is "one billion, one hundred thirty-one million, two hundred forty-five thousand, thirty-one".