31140312144 has 40 divisors (see below), whose sum is σ = 80484140352. Its totient is φ = 10375157760.

The previous prime is 31140312103. The next prime is 31140312167. The reversal of 31140312144 is 44121304113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52092 + ... + 254939.

Almost surely, 2^31140312144 is an apocalyptic number.

It is an amenable number.

31140312144 is an abundant number, since it is smaller than the sum of its proper divisors (49343828208).

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

31140312144 is a wasteful number, since it uses less digits than its factorization.

31140312144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309155 (or 309149 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31140312144 its reverse (44121304113), we get a palindrome (75261616257).

The spelling of 31140312144 in words is "thirty-one billion, one hundred forty million, three hundred twelve thousand, one hundred forty-four".