31040340131 has 4 divisors (see below), whose sum is σ = 31155732000. Its totient is φ = 30924948264.

The previous prime is 31040340127. The next prime is 31040340169. The reversal of 31040340131 is 13104304013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31040340131 - 2² = 31040340127 is a prime.

It is a super-2 number, since 2×31040340131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31040340101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57695531 + ... + 57696068.

It is an arithmetic number, because the mean of its divisors is an integer number (7788933000).

Almost surely, 2^31040340131 is an apocalyptic number.

31040340131 is a deficient number, since it is larger than the sum of its proper divisors (115391869).

31040340131 is a wasteful number, since it uses less digits than its factorization.

31040340131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115391868.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31040340131 its reverse (13104304013), we get a palindrome (44144644144).

The spelling of 31040340131 in words is "thirty-one billion, forty million, three hundred forty thousand, one hundred thirty-one".