2731195891 has 2 divisors, whose sum is σ = 2731195892. Its totient is φ = 2731195890.

The previous prime is 2731195867. The next prime is 2731195913. The reversal of 2731195891 is 1985911372.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2731195891 is a prime.

It is not a weakly prime, because it can be changed into another prime (2731195801) 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, 1365597945 + 1365597946.

It is an arithmetic number, because the mean of its divisors is an integer number (1365597946).

Almost surely, 2^2731195891 is an apocalyptic number.

2731195891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731195891 is an equidigital number, since it uses as much as digits as its factorization.

2731195891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 2731195891 is about 52260.8447214547. The cubic root of 2731195891 is about 1397.8190346279.

The spelling of 2731195891 in words is "two billion, seven hundred thirty-one million, one hundred ninety-five thousand, eight hundred ninety-one".