2158591 has 2 divisors, whose sum is σ = 2158592. Its totient is φ = 2158590.

The previous prime is 2158589. The next prime is 2158601. The reversal of 2158591 is 1958512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2158591 - 2¹ = 2158589 is a prime.

Together with 2158589, it forms a pair of twin primes.

2158591 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079295 + 1079296.

It is an arithmetic number, because the mean of its divisors is an integer number (1079296).

2^2158591 is an apocalyptic number.

2158591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158591 is an equidigital number, since it uses as much as digits as its factorization.

2158591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 31.

The square root of 2158591 is about 1469.2144159380. The cubic root of 2158591 is about 129.2379678948.

The spelling of 2158591 in words is "two million, one hundred fifty-eight thousand, five hundred ninety-one".