31392963491 has 2 divisors, whose sum is σ = 31392963492. Its totient is φ = 31392963490.

The previous prime is 31392963463. The next prime is 31392963499. The reversal of 31392963491 is 19436929313.

It is a strong prime.

It is an emirp because it is prime and its reverse (19436929313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31392963491 is a prime.

It is not a weakly prime, because it can be changed into another prime (31392963499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15696481745 + 15696481746.

It is an arithmetic number, because the mean of its divisors is an integer number (15696481746).

Almost surely, 2^31392963491 is an apocalyptic number.

31392963491 is a deficient number, since it is larger than the sum of its proper divisors (1).

31392963491 is an equidigital number, since it uses as much as digits as its factorization.

31392963491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 50.

The spelling of 31392963491 in words is "thirty-one billion, three hundred ninety-two million, nine hundred sixty-three thousand, four hundred ninety-one".