2491807091 has 2 divisors, whose sum is σ = 2491807092. Its totient is φ = 2491807090.

The previous prime is 2491807027. The next prime is 2491807093. The reversal of 2491807091 is 1907081942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2491807091 - 2⁶ = 2491807027 is a prime.

Together with 2491807093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2491807093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245903545 + 1245903546.

It is an arithmetic number, because the mean of its divisors is an integer number (1245903546).

Almost surely, 2^2491807091 is an apocalyptic number.

2491807091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491807091 is an equidigital number, since it uses as much as digits as its factorization.

2491807091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 2491807091 is about 49918.0036760286. The cubic root of 2491807091 is about 1355.7245873351.

The spelling of 2491807091 in words is "two billion, four hundred ninety-one million, eight hundred seven thousand, ninety-one".