31057131191 has 2 divisors, whose sum is σ = 31057131192. Its totient is φ = 31057131190.

The previous prime is 31057131167. The next prime is 31057131199. The reversal of 31057131191 is 19113175013.

It is a strong prime.

It is an emirp because it is prime and its reverse (19113175013) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31057131191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31057131199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15528565595 + 15528565596.

It is an arithmetic number, because the mean of its divisors is an integer number (15528565596).

Almost surely, 2^31057131191 is an apocalyptic number.

31057131191 is a deficient number, since it is larger than the sum of its proper divisors (1).

31057131191 is an equidigital number, since it uses as much as digits as its factorization.

31057131191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 32.

The spelling of 31057131191 in words is "thirty-one billion, fifty-seven million, one hundred thirty-one thousand, one hundred ninety-one".