25831481 has 12 divisors (see below), whose sum is σ = 28115388. Its totient is φ = 23721984.

The previous prime is 25831459. The next prime is 25831523. The reversal of 25831481 is 18413852.

It can be written as a sum of positive squares in 6 ways, for example, as 9703225 + 16128256 = 3115^2 + 4016^2 .

It is not a de Polignac number, because 25831481 - 2⁶ = 25831417 is a prime.

It is a super-2 number, since 2×25831481² = 1334530821306722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25831411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59441 + ... + 59873.

It is an arithmetic number, because the mean of its divisors is an integer number (2342949).

Almost surely, 2^25831481 is an apocalyptic number.

It is an amenable number.

25831481 is a deficient number, since it is larger than the sum of its proper divisors (2283907).

25831481 is a wasteful number, since it uses less digits than its factorization.

25831481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 799 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 25831481 is about 5082.4680028506. The cubic root of 25831481 is about 295.6081717421.

The spelling of 25831481 in words is "twenty-five million, eight hundred thirty-one thousand, four hundred eighty-one".