31131342 has 24 divisors (see below), whose sum is σ = 73583640. Its totient is φ = 9433680.

The previous prime is 31131337. The next prime is 31131379. The reversal of 31131342 is 24313113.

31131342 is a `hidden beast` number, since 311 + 313 + 42 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78417 + ... + 78812.

It is an arithmetic number, because the mean of its divisors is an integer number (3065985).

Almost surely, 2^31131342 is an apocalyptic number.

31131342 is an abundant number, since it is smaller than the sum of its proper divisors (42452298).

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

31131342 is a wasteful number, since it uses less digits than its factorization.

31131342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157248 (or 157245 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31131342 is about 5579.5467557858. The cubic root of 31131342 is about 314.5810909225.

Adding to 31131342 its reverse (24313113), we get a palindrome (55444455).

The spelling of 31131342 in words is "thirty-one million, one hundred thirty-one thousand, three hundred forty-two".