31020144 has 20 divisors (see below), whose sum is σ = 80135496. Its totient is φ = 10340032.

The previous prime is 31020137. The next prime is 31020191. The reversal of 31020144 is 44102013.

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, 323079 + ... + 323174.

Almost surely, 2^31020144 is an apocalyptic number.

It is an amenable number.

31020144 is an abundant number, since it is smaller than the sum of its proper divisors (49115352).

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

31020144 is a wasteful number, since it uses less digits than its factorization.

31020144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646264 (or 646258 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31020144 is about 5569.5730536550. The cubic root of 31020144 is about 314.2060934867.

Adding to 31020144 its reverse (44102013), we get a palindrome (75122157).

The spelling of 31020144 in words is "thirty-one million, twenty thousand, one hundred forty-four".