25811481 has 16 divisors (see below), whose sum is σ = 37072640. Its totient is φ = 15921360.

The previous prime is 25811473. The next prime is 25811483. The reversal of 25811481 is 18411852.

It is a happy number.

It is not a de Polignac number, because 25811481 - 2³ = 25811473 is a prime.

It is a super-2 number, since 2×25811481² = 1332465102826722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 5081-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25811483) by changing a digit.

It is a nontrivial repunit in base 5080.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2815 + ... + 7716.

It is an arithmetic number, because the mean of its divisors is an integer number (2317040).

Almost surely, 2^25811481 is an apocalyptic number.

It is an amenable number.

25811481 is a deficient number, since it is larger than the sum of its proper divisors (11261159).

25811481 is a wasteful number, since it uses less digits than its factorization.

25811481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10596.

The product of its digits is 2560, while the sum is 30.

The square root of 25811481 is about 5080.5000738116. The cubic root of 25811481 is about 295.5318605939.

The spelling of 25811481 in words is "twenty-five million, eight hundred eleven thousand, four hundred eighty-one".