2951591891 has 2 divisors, whose sum is σ = 2951591892. Its totient is φ = 2951591890.

The previous prime is 2951591849. The next prime is 2951591911. The reversal of 2951591891 is 1981951592.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2951591891 - 2⁶ = 2951591827 is a prime.

It is not a weakly prime, because it can be changed into another prime (2951591821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1475795945 + 1475795946.

It is an arithmetic number, because the mean of its divisors is an integer number (1475795946).

Almost surely, 2^2951591891 is an apocalyptic number.

2951591891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2951591891 is an equidigital number, since it uses as much as digits as its factorization.

2951591891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 50.

The square root of 2951591891 is about 54328.5550240387. Note that the first 3 decimals coincide. The cubic root of 2951591891 is about 1434.4500704938.

The spelling of 2951591891 in words is "two billion, nine hundred fifty-one million, five hundred ninety-one thousand, eight hundred ninety-one".