7591937891 has 2 divisors, whose sum is σ = 7591937892. Its totient is φ = 7591937890.

The previous prime is 7591937849. The next prime is 7591937893. The reversal of 7591937891 is 1987391957.

It is a strong prime.

It is an emirp because it is prime and its reverse (1987391957) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7591937891 is a prime.

Together with 7591937893, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7591937891.

It is not a weakly prime, because it can be changed into another prime (7591937893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3795968945 + 3795968946.

It is an arithmetic number, because the mean of its divisors is an integer number (3795968946).

Almost surely, 2^7591937891 is an apocalyptic number.

7591937891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7591937891 is an equidigital number, since it uses as much as digits as its factorization.

7591937891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 59.

The square root of 7591937891 is about 87131.7272352614. The cubic root of 7591937891 is about 1965.3996852657.

The spelling of 7591937891 in words is "seven billion, five hundred ninety-one million, nine hundred thirty-seven thousand, eight hundred ninety-one".