1131231031 has 16 divisors (see below), whose sum is σ = 1316397888. Its totient is φ = 952012800.

The previous prime is 1131230999. The next prime is 1131231053. The reversal of 1131231031 is 1301321311.

It is a cyclic number.

It is not a de Polignac number, because 1131231031 - 2⁵ = 1131230999 is a prime.

It is a super-2 number, since 2×1131231031² = 2559367290994645922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131230996 and 1131231014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131231091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271641 + ... + 275773.

It is an arithmetic number, because the mean of its divisors is an integer number (82274868).

Almost surely, 2^1131231031 is an apocalyptic number.

1131231031 is a deficient number, since it is larger than the sum of its proper divisors (185166857).

1131231031 is an equidigital number, since it uses as much as digits as its factorization.

1131231031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1131231031 is about 33633.7781255689. The cubic root of 1131231031 is about 1041.9585353802.

Adding to 1131231031 its reverse (1301321311), we get a palindrome (2432552342).

The spelling of 1131231031 in words is "one billion, one hundred thirty-one million, two hundred thirty-one thousand, thirty-one".