2521591 has 2 divisors, whose sum is σ = 2521592. Its totient is φ = 2521590.

The previous prime is 2521537. The next prime is 2521609. The reversal of 2521591 is 1951252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2521591 - 2¹⁷ = 2390519 is a prime.

It is equal to p₁₈₄₅₂₅ and since 2521591 and 184525 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260795 + 1260796.

It is an arithmetic number, because the mean of its divisors is an integer number (1260796).

2^2521591 is an apocalyptic number.

2521591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521591 is an equidigital number, since it uses as much as digits as its factorization.

2521591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 25.

The square root of 2521591 is about 1587.9518254657. The cubic root of 2521591 is about 136.1104746820.

The spelling of 2521591 in words is "two million, five hundred twenty-one thousand, five hundred ninety-one".