2591391 has 16 divisors (see below), whose sum is σ = 3968640. Its totient is φ = 1487520.

The previous prime is 2591389. The next prime is 2591401. The reversal of 2591391 is 1931952.

It is not a de Polignac number, because 2591391 - 2¹ = 2591389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440 + ... + 2693.

It is an arithmetic number, because the mean of its divisors is an integer number (248040).

2^2591391 is an apocalyptic number.

2591391 is a deficient number, since it is larger than the sum of its proper divisors (1377249).

2591391 is a wasteful number, since it uses less digits than its factorization.

2591391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166.

The product of its digits is 2430, while the sum is 30.

The square root of 2591391 is about 1609.7797986060. The cubic root of 2591391 is about 137.3549500697.

The spelling of 2591391 in words is "two million, five hundred ninety-one thousand, three hundred ninety-one".