31211142 has 8 divisors (see below), whose sum is σ = 62422296. Its totient is φ = 10403712.

The previous prime is 31211137. The next prime is 31211183. The reversal of 31211142 is 24111213.

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

31211142 is an admirable number.

It is a congruent number.

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, 2600923 + ... + 2600934.

It is an arithmetic number, because the mean of its divisors is an integer number (7802787).

Almost surely, 2^31211142 is an apocalyptic number.

31211142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31211142 is a wasteful number, since it uses less digits than its factorization.

31211142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201862.

The product of its digits is 48, while the sum is 15.

The square root of 31211142 is about 5586.6932974703. The cubic root of 31211142 is about 314.8496536242.

Adding to 31211142 its reverse (24111213), we get a palindrome (55322355).

The spelling of 31211142 in words is "thirty-one million, two hundred eleven thousand, one hundred forty-two".