25216481 has 2 divisors, whose sum is σ = 25216482. Its totient is φ = 25216480.

The previous prime is 25216469. The next prime is 25216483. The reversal of 25216481 is 18461252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 9096256 = 4015^2 + 3016^2 .

It is a cyclic number.

It is not a de Polignac number, because 25216481 - 2⁶ = 25216417 is a prime.

It is a super-2 number, since 2×25216481² = 1271741828046722, which contains 22 as substring.

Together with 25216483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25216483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12608240 + 12608241.

It is an arithmetic number, because the mean of its divisors is an integer number (12608241).

Almost surely, 2^25216481 is an apocalyptic number.

It is an amenable number.

25216481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25216481 is an equidigital number, since it uses as much as digits as its factorization.

25216481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 25216481 is about 5021.6014377885. The cubic root of 25216481 is about 293.2433417412.

The spelling of 25216481 in words is "twenty-five million, two hundred sixteen thousand, four hundred eighty-one".