31091761663 has 2 divisors, whose sum is σ = 31091761664. Its totient is φ = 31091761662.

The previous prime is 31091761579. The next prime is 31091761697. The reversal of 31091761663 is 36616719013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31091761663 - 2¹³ = 31091753471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31091761963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15545880831 + 15545880832.

It is an arithmetic number, because the mean of its divisors is an integer number (15545880832).

Almost surely, 2^31091761663 is an apocalyptic number.

31091761663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31091761663 is an equidigital number, since it uses as much as digits as its factorization.

31091761663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 31091761663 in words is "thirty-one billion, ninety-one million, seven hundred sixty-one thousand, six hundred sixty-three".