31240861747 has 2 divisors, whose sum is σ = 31240861748. Its totient is φ = 31240861746.

The previous prime is 31240861703. The next prime is 31240861781. The reversal of 31240861747 is 74716804213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31240861747 - 2¹⁵ = 31240828979 is a prime.

It is not a weakly prime, because it can be changed into another prime (31240861787) 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, 15620430873 + 15620430874.

It is an arithmetic number, because the mean of its divisors is an integer number (15620430874).

Almost surely, 2^31240861747 is an apocalyptic number.

31240861747 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240861747 is an equidigital number, since it uses as much as digits as its factorization.

31240861747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 31240861747 in words is "thirty-one billion, two hundred forty million, eight hundred sixty-one thousand, seven hundred forty-seven".