31316643191 has 2 divisors, whose sum is σ = 31316643192. Its totient is φ = 31316643190.

The previous prime is 31316643139. The next prime is 31316643203. The reversal of 31316643191 is 19134661313.

It is a strong prime.

It is an emirp because it is prime and its reverse (19134661313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31316643191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31316643101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658321595 + 15658321596.

It is an arithmetic number, because the mean of its divisors is an integer number (15658321596).

Almost surely, 2^31316643191 is an apocalyptic number.

31316643191 is a deficient number, since it is larger than the sum of its proper divisors (1).

31316643191 is an equidigital number, since it uses as much as digits as its factorization.

31316643191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The spelling of 31316643191 in words is "thirty-one billion, three hundred sixteen million, six hundred forty-three thousand, one hundred ninety-one".