25791481 has 4 divisors (see below), whose sum is σ = 25817764. Its totient is φ = 25765200.

The previous prime is 25791463. The next prime is 25791497. The reversal of 25791481 is 18419752.

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 8643600 + 17147881 = 2940^2 + 4141^2 .

It is a cyclic number.

It is not a de Polignac number, because 25791481 - 2¹⁵ = 25758713 is a prime.

It is a super-2 number, since 2×25791481² = 1330400984346722, which contains 22 as substring.

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 25791481.

It is not an unprimeable number, because it can be changed into a prime (25791401) 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, 11610 + ... + 13651.

It is an arithmetic number, because the mean of its divisors is an integer number (6454441).

Almost surely, 2^25791481 is an apocalyptic number.

It is an amenable number.

25791481 is a deficient number, since it is larger than the sum of its proper divisors (26283).

25791481 is a wasteful number, since it uses less digits than its factorization.

25791481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26282.

The product of its digits is 20160, while the sum is 37.

The square root of 25791481 is about 5078.5313822010. The cubic root of 25791481 is about 295.4555100159.

The spelling of 25791481 in words is "twenty-five million, seven hundred ninety-one thousand, four hundred eighty-one".