31002144 has 24 divisors (see below), whose sum is σ = 81380880. Its totient is φ = 10334016.

The previous prime is 31002121. The next prime is 31002157. The reversal of 31002144 is 44120013.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×31002144² = 1922265865193472, which contains 22 as substring.

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, 161374 + ... + 161565.

It is an arithmetic number, because the mean of its divisors is an integer number (3390870).

Almost surely, 2^31002144 is an apocalyptic number.

It is an amenable number.

31002144 is an abundant number, since it is smaller than the sum of its proper divisors (50378736).

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

31002144 is a wasteful number, since it uses less digits than its factorization.

31002144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322952 (or 322944 counting only the distinct ones).

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

The square root of 31002144 is about 5567.9568963849. The cubic root of 31002144 is about 314.1453071368.

Adding to 31002144 its reverse (44120013), we get a palindrome (75122157).

The spelling of 31002144 in words is "thirty-one million, two thousand, one hundred forty-four".