2091485905 has 4 divisors (see below), whose sum is σ = 2509783092. Its totient is φ = 1673188720.

The previous prime is 2091485839. The next prime is 2091485917. The reversal of 2091485905 is 5095841902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1464133696 + 627352209 = 38264^2 + 25047^2 .

It is not a de Polignac number, because 2091485905 - 2⁹ = 2091485393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209148586 + ... + 209148595.

It is an arithmetic number, because the mean of its divisors is an integer number (627445773).

Almost surely, 2^2091485905 is an apocalyptic number.

It is an amenable number.

2091485905 is a deficient number, since it is larger than the sum of its proper divisors (418297187).

2091485905 is an equidigital number, since it uses as much as digits as its factorization.

2091485905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418297186.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2091485905 is about 45732.7662076109. The cubic root of 2091485905 is about 1278.8461902736.

The spelling of 2091485905 in words is "two billion, ninety-one million, four hundred eighty-five thousand, nine hundred five".