1231140031 has 6 divisors (see below), whose sum is σ = 1353236696. Its totient is φ = 1119218100.

The previous prime is 1231140023. The next prime is 1231140049. The reversal of 1231140031 is 1300411321.

It is not a de Polignac number, because 1231140031 - 2³ = 1231140023 is a prime.

It is a super-2 number, since 2×1231140031² = 3031411551861361922, 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 = 1231139987 and 1231140014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231140061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5087235 + ... + 5087476.

Almost surely, 2^1231140031 is an apocalyptic number.

1231140031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231140031 is a deficient number, since it is larger than the sum of its proper divisors (122096665).

1231140031 is a wasteful number, since it uses less digits than its factorization.

1231140031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10174733 (or 10174722 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231140031 is about 35087.6050906869. The cubic root of 1231140031 is about 1071.7721908505.

Adding to 1231140031 its reverse (1300411321), we get a palindrome (2531551352).

The spelling of 1231140031 in words is "one billion, two hundred thirty-one million, one hundred forty thousand, thirty-one".