25494481 has 2 divisors, whose sum is σ = 25494482. Its totient is φ = 25494480.

The previous prime is 25494479. The next prime is 25494527. The reversal of 25494481 is 18449452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19219456 + 6275025 = 4384^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 25494481 - 2¹ = 25494479 is a prime.

It is a super-2 number, since 2×25494481² = 1299937122918722, which contains 22 as substring.

Together with 25494479, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25494481.

It is not a weakly prime, because it can be changed into another prime (25494421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12747240 + 12747241.

It is an arithmetic number, because the mean of its divisors is an integer number (12747241).

Almost surely, 2^25494481 is an apocalyptic number.

It is an amenable number.

25494481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25494481 is an equidigital number, since it uses as much as digits as its factorization.

25494481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 25494481 is about 5049.2059771810. The cubic root of 25494481 is about 294.3170296337.

It can be divided in two parts, 254944 and 81, that added together give a square (255025 = 505²).

The spelling of 25494481 in words is "twenty-five million, four hundred ninety-four thousand, four hundred eighty-one".