25220591 has 4 divisors (see below), whose sum is σ = 27513384. Its totient is φ = 22927800.

The previous prime is 25220579. The next prime is 25220597. The reversal of 25220591 is 19502252.

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 25220591 - 2²² = 21026287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25220591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220597) 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, 1146380 + ... + 1146401.

It is an arithmetic number, because the mean of its divisors is an integer number (6878346).

Almost surely, 2^25220591 is an apocalyptic number.

25220591 is a deficient number, since it is larger than the sum of its proper divisors (2292793).

25220591 is a wasteful number, since it uses less digits than its factorization.

25220591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292792.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25220591 is about 5022.0106531149. The cubic root of 25220591 is about 293.2592726538.

The spelling of 25220591 in words is "twenty-five million, two hundred twenty thousand, five hundred ninety-one".