25405591 has 2 divisors, whose sum is σ = 25405592. Its totient is φ = 25405590.

The previous prime is 25405571. The next prime is 25405619. The reversal of 25405591 is 19550452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25405591 - 2¹⁷ = 25274519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25405511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702795 + 12702796.

It is an arithmetic number, because the mean of its divisors is an integer number (12702796).

Almost surely, 2^25405591 is an apocalyptic number.

25405591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25405591 is an equidigital number, since it uses as much as digits as its factorization.

25405591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 25405591 is about 5040.3959169891. The cubic root of 25405591 is about 293.9745724380.

The spelling of 25405591 in words is "twenty-five million, four hundred five thousand, five hundred ninety-one".