31131023144 has 32 divisors (see below), whose sum is σ = 63618095520. Its totient is φ = 14195050176.

The previous prime is 31131023141. The next prime is 31131023167. The reversal of 31131023144 is 44132013113.

It is not an unprimeable number, because it can be changed into a prime (31131023141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1794602 + ... + 1811865.

It is an arithmetic number, because the mean of its divisors is an integer number (1988065485).

Almost surely, 2^31131023144 is an apocalyptic number.

It is an amenable number.

31131023144 is an abundant number, since it is smaller than the sum of its proper divisors (32487072376).

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

31131023144 is a wasteful number, since it uses less digits than its factorization.

31131023144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606569 (or 3606565 counting only the distinct ones).

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

Adding to 31131023144 its reverse (44132013113), we get a palindrome (75263036257).

The spelling of 31131023144 in words is "thirty-one billion, one hundred thirty-one million, twenty-three thousand, one hundred forty-four".