31316144 has 20 divisors (see below), whose sum is σ = 61115880. Its totient is φ = 15544320.

The previous prime is 31316141. The next prime is 31316167. The reversal of 31316144 is 44161313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316141) 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, 4817 + ... + 9264.

It is an arithmetic number, because the mean of its divisors is an integer number (3055794).

Almost surely, 2^31316144 is an apocalyptic number.

It is an amenable number.

31316144 is a deficient number, since it is larger than the sum of its proper divisors (29799736).

31316144 is a wasteful number, since it uses less digits than its factorization.

31316144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14228 (or 14222 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 31316144 is about 5596.0829157546. The cubic root of 31316144 is about 315.2023357811.

Adding to 31316144 its reverse (44161313), we get a palindrome (75477457).

The spelling of 31316144 in words is "thirty-one million, three hundred sixteen thousand, one hundred forty-four".