25217629 has 2 divisors, whose sum is σ = 25217630. Its totient is φ = 25217628.

The previous prime is 25217627. The next prime is 25217639. The reversal of 25217629 is 92671252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13860729 + 11356900 = 3723^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 25217629 - 2¹ = 25217627 is a prime.

Together with 25217627, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25217594 and 25217603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25217623) 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, 12608814 + 12608815.

It is an arithmetic number, because the mean of its divisors is an integer number (12608815).

Almost surely, 2^25217629 is an apocalyptic number.

It is an amenable number.

25217629 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217629 is an equidigital number, since it uses as much as digits as its factorization.

25217629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 25217629 is about 5021.7157426521. The cubic root of 25217629 is about 293.2477917178.

The spelling of 25217629 in words is "twenty-five million, two hundred seventeen thousand, six hundred twenty-nine".