1031131231 has 4 divisors (see below), whose sum is σ = 1110449032. Its totient is φ = 951813432.

The previous prime is 1031131183. The next prime is 1031131267. The reversal of 1031131231 is 1321311301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1031131231 - 2⁷ = 1031131103 is a prime.

It is a super-2 number, since 2×1031131231² = 2126463231087150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031171231) 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 3 ways as a sum of consecutive naturals, for example, 39658881 + ... + 39658906.

It is an arithmetic number, because the mean of its divisors is an integer number (277612258).

Almost surely, 2^1031131231 is an apocalyptic number.

1031131231 is a deficient number, since it is larger than the sum of its proper divisors (79317801).

1031131231 is an equidigital number, since it uses as much as digits as its factorization.

1031131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79317800.

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

The square root of 1031131231 is about 32111.2321625938. The cubic root of 1031131231 is about 1010.2712178858.

Adding to 1031131231 its reverse (1321311301), we get a palindrome (2352442532).

The spelling of 1031131231 in words is "one billion, thirty-one million, one hundred thirty-one thousand, two hundred thirty-one".