31191361783 has 2 divisors, whose sum is σ = 31191361784. Its totient is φ = 31191361782.

The previous prime is 31191361777. The next prime is 31191361787. The reversal of 31191361783 is 38716319113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31191361783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31191361787) 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, 15595680891 + 15595680892.

It is an arithmetic number, because the mean of its divisors is an integer number (15595680892).

Almost surely, 2^31191361783 is an apocalyptic number.

31191361783 is a deficient number, since it is larger than the sum of its proper divisors (1).

31191361783 is an equidigital number, since it uses as much as digits as its factorization.

31191361783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The spelling of 31191361783 in words is "thirty-one billion, one hundred ninety-one million, three hundred sixty-one thousand, seven hundred eighty-three".