25535591 has 4 divisors (see below), whose sum is σ = 25575000. Its totient is φ = 25496184.

The previous prime is 25535557. The next prime is 25535597. The reversal of 25535591 is 19553552.

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 25535591 - 2¹⁰ = 25534567 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 (25535597) 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, 18716 + ... + 20033.

It is an arithmetic number, because the mean of its divisors is an integer number (6393750).

Almost surely, 2^25535591 is an apocalyptic number.

25535591 is a deficient number, since it is larger than the sum of its proper divisors (39409).

25535591 is an equidigital number, since it uses as much as digits as its factorization.

25535591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39408.

The product of its digits is 33750, while the sum is 35.

The square root of 25535591 is about 5053.2752745126. The cubic root of 25535591 is about 294.4751406575.

The spelling of 25535591 in words is "twenty-five million, five hundred thirty-five thousand, five hundred ninety-one".