31241547391 has 2 divisors, whose sum is σ = 31241547392. Its totient is φ = 31241547390.

The previous prime is 31241547353. The next prime is 31241547397. The reversal of 31241547391 is 19374514213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31241547391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31241547397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620773695 + 15620773696.

It is an arithmetic number, because the mean of its divisors is an integer number (15620773696).

Almost surely, 2^31241547391 is an apocalyptic number.

31241547391 is a deficient number, since it is larger than the sum of its proper divisors (1).

31241547391 is an equidigital number, since it uses as much as digits as its factorization.

31241547391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The spelling of 31241547391 in words is "thirty-one billion, two hundred forty-one million, five hundred forty-seven thousand, three hundred ninety-one".