31275764791 has 2 divisors, whose sum is σ = 31275764792. Its totient is φ = 31275764790.

The previous prime is 31275764761. The next prime is 31275764837. The reversal of 31275764791 is 19746757213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31275764791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31275764731) 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, 15637882395 + 15637882396.

It is an arithmetic number, because the mean of its divisors is an integer number (15637882396).

Almost surely, 2^31275764791 is an apocalyptic number.

31275764791 is a deficient number, since it is larger than the sum of its proper divisors (1).

31275764791 is an equidigital number, since it uses as much as digits as its factorization.

31275764791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222640, while the sum is 52.

The spelling of 31275764791 in words is "thirty-one billion, two hundred seventy-five million, seven hundred sixty-four thousand, seven hundred ninety-one".