2505391 has 4 divisors (see below), whose sum is σ = 2863312. Its totient is φ = 2147472.

The previous prime is 2505383. The next prime is 2505401. The reversal of 2505391 is 1935052.

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 2505391 - 2³ = 2505383 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 (2505301) 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 3 ways as a sum of consecutive naturals, for example, 178950 + ... + 178963.

It is an arithmetic number, because the mean of its divisors is an integer number (715828).

2^2505391 is an apocalyptic number.

2505391 is a deficient number, since it is larger than the sum of its proper divisors (357921).

2505391 is an equidigital number, since it uses as much as digits as its factorization.

2505391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357920.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 2505391 is about 1582.8426959114. The cubic root of 2505391 is about 135.8183669594.

The spelling of 2505391 in words is "two million, five hundred five thousand, three hundred ninety-one".