2591399 has 4 divisors (see below), whose sum is σ = 2599560. Its totient is φ = 2583240.

The previous prime is 2591389. The next prime is 2591401. The reversal of 2591399 is 9931952.

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 2591399 - 2⁸ = 2591143 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 (2591389) 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, 3584 + ... + 4245.

It is an arithmetic number, because the mean of its divisors is an integer number (649890).

2^2591399 is an apocalyptic number.

2591399 is a deficient number, since it is larger than the sum of its proper divisors (8161).

2591399 is an equidigital number, since it uses as much as digits as its factorization.

2591399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160.

The product of its digits is 21870, while the sum is 38.

The square root of 2591399 is about 1609.7822834160. The cubic root of 2591399 is about 137.3550914144.

The spelling of 2591399 in words is "two million, five hundred ninety-one thousand, three hundred ninety-nine".