31240352137 has 2 divisors, whose sum is σ = 31240352138. Its totient is φ = 31240352136.

The previous prime is 31240352119. The next prime is 31240352173. The reversal of 31240352137 is 73125304213.

Together with next prime (31240352173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27735238521 + 3505113616 = 166539^2 + 59204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31240352137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31240352099 and 31240352108.

It is not a weakly prime, because it can be changed into another prime (31240352237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620176068 + 15620176069.

It is an arithmetic number, because the mean of its divisors is an integer number (15620176069).

Almost surely, 2^31240352137 is an apocalyptic number.

It is an amenable number.

31240352137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240352137 is an equidigital number, since it uses as much as digits as its factorization.

31240352137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 31240352137 in words is "thirty-one billion, two hundred forty million, three hundred fifty-two thousand, one hundred thirty-seven".