31331133140 has 24 divisors (see below), whose sum is σ = 68656049280. Its totient is φ = 11987563808.

The previous prime is 31331133137. The next prime is 31331133143. The reversal of 31331133140 is 4133113313.

It is an interprime number because it is at equal distance from previous prime (31331133137) and next prime (31331133143).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331133143) 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, 34055120 + ... + 34056039.

It is an arithmetic number, because the mean of its divisors is an integer number (2860668720).

Almost surely, 2^31331133140 is an apocalyptic number.

It is an amenable number.

31331133140 is an abundant number, since it is smaller than the sum of its proper divisors (37324916140).

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

31331133140 is a wasteful number, since it uses less digits than its factorization.

31331133140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68111191 (or 68111189 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31331133140 its reverse (4133113313), we get a palindrome (35464246453).

The spelling of 31331133140 in words is "thirty-one billion, three hundred thirty-one million, one hundred thirty-three thousand, one hundred forty".