25198591 has 16 divisors (see below), whose sum is σ = 28558368. Its totient is φ = 22032000.

The previous prime is 25198583. The next prime is 25198597. The reversal of 25198591 is 19589152.

It is a 7-Lehmer number, since φ(25198591) divides (25198591-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 25198591 - 2³ = 25198583 is a prime.

It is a super-3 number, since 3×25198591³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25198597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40801 + ... + 41413.

It is an arithmetic number, because the mean of its divisors is an integer number (1784898).

Almost surely, 2^25198591 is an apocalyptic number.

25198591 is a deficient number, since it is larger than the sum of its proper divisors (3359777).

25198591 is a wasteful number, since it uses less digits than its factorization.

25198591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

The product of its digits is 32400, while the sum is 40.

The square root of 25198591 is about 5019.8198174835. The cubic root of 25198591 is about 293.1739775226.

The spelling of 25198591 in words is "twenty-five million, one hundred ninety-eight thousand, five hundred ninety-one".