231131412 has 72 divisors (see below), whose sum is σ = 611799552. Its totient is φ = 73483200.

The previous prime is 231131401. The next prime is 231131413. The reversal of 231131412 is 214131132.

It is a super-2 number, since 2×231131412² = 106843459226227488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77778 + ... + 80694.

It is an arithmetic number, because the mean of its divisors is an integer number (8497216).

Almost surely, 2^231131412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231131412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305899776).

231131412 is an abundant number, since it is smaller than the sum of its proper divisors (380668140).

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

231131412 is a wasteful number, since it uses less digits than its factorization.

231131412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029 (or 3024 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 231131412 is about 15203.0066763124. The cubic root of 231131412 is about 613.6955735339.

Adding to 231131412 its reverse (214131132), we get a palindrome (445262544).

The spelling of 231131412 in words is "two hundred thirty-one million, one hundred thirty-one thousand, four hundred twelve".