31240330397 has 2 divisors, whose sum is σ = 31240330398. Its totient is φ = 31240330396.

The previous prime is 31240330379. The next prime is 31240330411. The reversal of 31240330397 is 79303304213.

Together with previous prime (31240330379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22168529881 + 9071800516 = 148891^2 + 95246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31240330397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31240330327) 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 as a sum of consecutive naturals, namely, 15620165198 + 15620165199.

It is an arithmetic number, because the mean of its divisors is an integer number (15620165199).

Almost surely, 2^31240330397 is an apocalyptic number.

It is an amenable number.

31240330397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240330397 is an equidigital number, since it uses as much as digits as its factorization.

31240330397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 35.

The spelling of 31240330397 in words is "thirty-one billion, two hundred forty million, three hundred thirty thousand, three hundred ninety-seven".