31193919943 has 2 divisors, whose sum is σ = 31193919944. Its totient is φ = 31193919942.

The previous prime is 31193919923. The next prime is 31193919949. The reversal of 31193919943 is 34991939113.

It is a strong prime.

It is an emirp because it is prime and its reverse (34991939113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31193919943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31193919949) 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, 15596959971 + 15596959972.

It is an arithmetic number, because the mean of its divisors is an integer number (15596959972).

Almost surely, 2^31193919943 is an apocalyptic number.

31193919943 is a deficient number, since it is larger than the sum of its proper divisors (1).

31193919943 is an equidigital number, since it uses as much as digits as its factorization.

31193919943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 52.

The spelling of 31193919943 in words is "thirty-one billion, one hundred ninety-three million, nine hundred nineteen thousand, nine hundred forty-three".