31012144 has 20 divisors (see below), whose sum is σ = 60180424. Its totient is φ = 15481728.

The previous prime is 31012141. The next prime is 31012169. The reversal of 31012144 is 44121013.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (31012141) 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, 13444 + ... + 15580.

Almost surely, 2^31012144 is an apocalyptic number.

It is an amenable number.

31012144 is a deficient number, since it is larger than the sum of its proper divisors (29168280).

31012144 is a wasteful number, since it uses less digits than its factorization.

31012144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31012144 is about 5568.8548194400. The cubic root of 31012144 is about 314.1790802351.

Adding to 31012144 its reverse (44121013), we get a palindrome (75133157).

The spelling of 31012144 in words is "thirty-one million, twelve thousand, one hundred forty-four".