1231113144 has 32 divisors (see below), whose sum is σ = 3106026000. Its totient is φ = 406605312.

The previous prime is 1231113119. The next prime is 1231113209. The reversal of 1231113144 is 4413111321.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1231113144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232689 + ... + 237920.

Almost surely, 2^1231113144 is an apocalyptic number.

It is an amenable number.

1231113144 is an abundant number, since it is smaller than the sum of its proper divisors (1874912856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231113144 is a wasteful number, since it uses less digits than its factorization.

1231113144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470727 (or 470723 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 1231113144 is about 35087.2219475980. The cubic root of 1231113144 is about 1071.7643886109.

Adding to 1231113144 its reverse (4413111321), we get a palindrome (5644224465).

The spelling of 1231113144 in words is "one billion, two hundred thirty-one million, one hundred thirteen thousand, one hundred forty-four".