31540304140 has 24 divisors (see below), whose sum is σ = 66291639120. Its totient is φ = 12605264448.

The previous prime is 31540304123. The next prime is 31540304143. The reversal of 31540304140 is 4140304513.

It is a super-2 number, since 2×31540304140² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31540304143) 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, 654735 + ... + 701254.

It is an arithmetic number, because the mean of its divisors is an integer number (2762151630).

Almost surely, 2^31540304140 is an apocalyptic number.

It is an amenable number.

31540304140 is an abundant number, since it is smaller than the sum of its proper divisors (34751334980).

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

31540304140 is a wasteful number, since it uses less digits than its factorization.

31540304140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357161 (or 1357159 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31540304140 its reverse (4140304513), we get a palindrome (35680608653).

The spelling of 31540304140 in words is "thirty-one billion, five hundred forty million, three hundred four thousand, one hundred forty".