25791549 has 16 divisors (see below), whose sum is σ = 40044672. Its totient is φ = 14459328.

The previous prime is 25791523. The next prime is 25791581. The reversal of 25791549 is 94519752.

It is not a de Polignac number, because 25791549 - 2⁷ = 25791421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25791549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25790549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10474 + ... + 12699.

It is an arithmetic number, because the mean of its divisors is an integer number (2502792).

Almost surely, 2^25791549 is an apocalyptic number.

It is an amenable number.

25791549 is a deficient number, since it is larger than the sum of its proper divisors (14253123).

25791549 is a wasteful number, since it uses less digits than its factorization.

25791549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23236.

The product of its digits is 113400, while the sum is 42.

The square root of 25791549 is about 5078.5380770454. The cubic root of 25791549 is about 295.4557696747.

It can be divided in two parts, 257 and 91549, that added together give a triangular number (91806 = T₄₂₈).

The spelling of 25791549 in words is "twenty-five million, seven hundred ninety-one thousand, five hundred forty-nine".