31231442 has 8 divisors (see below), whose sum is σ = 51106032. Its totient is φ = 14196100.

The previous prime is 31231433. The next prime is 31231457. The reversal of 31231442 is 24413213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709784 + ... + 709827.

It is an arithmetic number, because the mean of its divisors is an integer number (6388254).

Almost surely, 2^31231442 is an apocalyptic number.

31231442 is a deficient number, since it is larger than the sum of its proper divisors (19874590).

31231442 is a wasteful number, since it uses less digits than its factorization.

31231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419624.

The product of its digits is 576, while the sum is 20.

The square root of 31231442 is about 5588.5098192631. The cubic root of 31231442 is about 314.9178991542.

Adding to 31231442 its reverse (24413213), we get a palindrome (55644655).

The spelling of 31231442 in words is "thirty-one million, two hundred thirty-one thousand, four hundred forty-two".