2091974243 has 4 divisors (see below), whose sum is σ = 2094086208. Its totient is φ = 2089862280.

The previous prime is 2091974237. The next prime is 2091974251. The reversal of 2091974243 is 3424791902.

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

It is a cyclic number.

It is not a de Polignac number, because 2091974243 - 2⁶ = 2091974179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2091974243.

It is not an unprimeable number, because it can be changed into a prime (2091971243) 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 in 3 ways as a sum of consecutive naturals, for example, 1054496 + ... + 1056477.

It is an arithmetic number, because the mean of its divisors is an integer number (523521552).

Almost surely, 2^2091974243 is an apocalyptic number.

2091974243 is a deficient number, since it is larger than the sum of its proper divisors (2111965).

2091974243 is an equidigital number, since it uses as much as digits as its factorization.

2091974243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111964.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 2091974243 is about 45738.1049345073. The cubic root of 2091974243 is about 1278.9457145067.

The spelling of 2091974243 in words is "two billion, ninety-one million, nine hundred seventy-four thousand, two hundred forty-three".