25741721 has 2 divisors, whose sum is σ = 25741722. Its totient is φ = 25741720.

The previous prime is 25741717. The next prime is 25741733. The reversal of 25741721 is 12714752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 3463321 = 4720^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 25741721 - 2² = 25741717 is a prime.

It is equal to p_1609337 and since 25741721 and 1609337 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25743721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12870860 + 12870861.

It is an arithmetic number, because the mean of its divisors is an integer number (12870861).

Almost surely, 2^25741721 is an apocalyptic number.

It is an amenable number.

25741721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25741721 is an equidigital number, since it uses as much as digits as its factorization.

25741721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 29.

The square root of 25741721 is about 5073.6299628570. The cubic root of 25741721 is about 295.2653783571.

It can be divided in two parts, 25741 and 721, that added together give a palindrome (26462).

The spelling of 25741721 in words is "twenty-five million, seven hundred forty-one thousand, seven hundred twenty-one".