31310240140 has 24 divisors (see below), whose sum is σ = 65755821600. Its totient is φ = 12523273728.

The previous prime is 31310240111. The next prime is 31310240141. The reversal of 31310240140 is 4104201313.

It is a super-2 number, since 2×31310240140² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31310240141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329761 + ... + 413959.

It is an arithmetic number, because the mean of its divisors is an integer number (2739825900).

Almost surely, 2^31310240140 is an apocalyptic number.

It is an amenable number.

31310240140 is an abundant number, since it is smaller than the sum of its proper divisors (34445581460).

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

31310240140 is a wasteful number, since it uses less digits than its factorization.

31310240140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102801 (or 102799 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31310240140 its reverse (4104201313), we get a palindrome (35414441453).

The spelling of 31310240140 in words is "thirty-one billion, three hundred ten million, two hundred forty thousand, one hundred forty".