2090517991 has 2 divisors, whose sum is σ = 2090517992. Its totient is φ = 2090517990.

The previous prime is 2090517977. The next prime is 2090518013. The reversal of 2090517991 is 1997150902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2090517991 - 2⁹ = 2090517479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2090517901) 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, 1045258995 + 1045258996.

It is an arithmetic number, because the mean of its divisors is an integer number (1045258996).

Almost surely, 2^2090517991 is an apocalyptic number.

2090517991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2090517991 is an equidigital number, since it uses as much as digits as its factorization.

2090517991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 2090517991 is about 45722.1827016165. The cubic root of 2090517991 is about 1278.6488817276.

The spelling of 2090517991 in words is "two billion, ninety million, five hundred seventeen thousand, nine hundred ninety-one".