2091917213 has 4 divisors (see below), whose sum is σ = 2096027580. Its totient is φ = 2087806848.

The previous prime is 2091917207. The next prime is 2091917227. The reversal of 2091917213 is 3127191902.

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 597166969 + 1494750244 = 24437^2 + 38662^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091917213 - 2¹⁴ = 2091900829 is a prime.

It is a super-2 number, since 2×2091917213² = 8752235252091374738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091917263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054420 + ... + 2055437.

It is an arithmetic number, because the mean of its divisors is an integer number (524006895).

Almost surely, 2^2091917213 is an apocalyptic number.

It is an amenable number.

2091917213 is a deficient number, since it is larger than the sum of its proper divisors (4110367).

2091917213 is an equidigital number, since it uses as much as digits as its factorization.

2091917213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110366.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 2091917213 is about 45737.4814894743. The cubic root of 2091917213 is about 1278.9340924807.

The spelling of 2091917213 in words is "two billion, ninety-one million, nine hundred seventeen thousand, two hundred thirteen".