31143244 has 12 divisors (see below), whose sum is σ = 59455368. Its totient is φ = 14156000.

The previous prime is 31143241. The next prime is 31143257. The reversal of 31143244 is 44234113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (31143241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353857 + ... + 353944.

It is an arithmetic number, because the mean of its divisors is an integer number (4954614).

Almost surely, 2^31143244 is an apocalyptic number.

It is an amenable number.

31143244 is a deficient number, since it is larger than the sum of its proper divisors (28312124).

31143244 is a wasteful number, since it uses less digits than its factorization.

31143244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707816 (or 707814 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 31143244 is about 5580.6132279526. The cubic root of 31143244 is about 314.6211755752.

Adding to 31143244 its reverse (44234113), we get a palindrome (75377357).

The spelling of 31143244 in words is "thirty-one million, one hundred forty-three thousand, two hundred forty-four".