1231131342 has 16 divisors (see below), whose sum is σ = 2814014592. Its totient is φ = 351751800.

The previous prime is 1231131331. The next prime is 1231131379. The reversal of 1231131342 is 2431311321.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 14656284 + ... + 14656367.

It is an arithmetic number, because the mean of its divisors is an integer number (175875912).

Almost surely, 2^1231131342 is an apocalyptic number.

1231131342 is an abundant number, since it is smaller than the sum of its proper divisors (1582883250).

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

1231131342 is a wasteful number, since it uses less digits than its factorization.

1231131342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29312663.

The product of its digits is 432, while the sum is 21.

The square root of 1231131342 is about 35087.4812718155. The cubic root of 1231131342 is about 1071.7696694340.

Adding to 1231131342 its reverse (2431311321), we get a palindrome (3662442663).

The spelling of 1231131342 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, three hundred forty-two".