25545749 has 4 divisors (see below), whose sum is σ = 25558860. Its totient is φ = 25532640.

The previous prime is 25545743. The next prime is 25545757. The reversal of 25545749 is 94754552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6666724 + 18879025 = 2582^2 + 4345^2 .

It is a cyclic number.

It is not a de Polignac number, because 25545749 - 2⁸ = 25545493 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25545743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984 + ... + 7745.

It is an arithmetic number, because the mean of its divisors is an integer number (6389715).

Almost surely, 2^25545749 is an apocalyptic number.

It is an amenable number.

25545749 is a deficient number, since it is larger than the sum of its proper divisors (13111).

25545749 is a wasteful number, since it uses less digits than its factorization.

25545749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13110.

The product of its digits is 252000, while the sum is 41.

The square root of 25545749 is about 5054.2802652801. The cubic root of 25545749 is about 294.5141826613.

The spelling of 25545749 in words is "twenty-five million, five hundred forty-five thousand, seven hundred forty-nine".