2159791 has 4 divisors (see below), whose sum is σ = 2205792. Its totient is φ = 2113792.

The previous prime is 2159789. The next prime is 2159809. The reversal of 2159791 is 1979512.

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 2159791 - 2¹ = 2159789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159701) 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, 22930 + ... + 23023.

It is an arithmetic number, because the mean of its divisors is an integer number (551448).

2^2159791 is an apocalyptic number.

2159791 is a deficient number, since it is larger than the sum of its proper divisors (46001).

2159791 is an equidigital number, since it uses as much as digits as its factorization.

2159791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46000.

The product of its digits is 5670, while the sum is 34.

The square root of 2159791 is about 1469.6227407059. The cubic root of 2159791 is about 129.2619120373.

The spelling of 2159791 in words is "two million, one hundred fifty-nine thousand, seven hundred ninety-one".