25951217 has 2 divisors, whose sum is σ = 25951218. Its totient is φ = 25951216.

The previous prime is 25951213. The next prime is 25951223. The reversal of 25951217 is 71215952.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 11806096 = 3761^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 25951217 - 2² = 25951213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25951213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12975608 + 12975609.

It is an arithmetic number, because the mean of its divisors is an integer number (12975609).

Almost surely, 2^25951217 is an apocalyptic number.

It is an amenable number.

25951217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25951217 is an equidigital number, since it uses as much as digits as its factorization.

25951217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 32.

The square root of 25951217 is about 5094.2337009603. The cubic root of 25951217 is about 296.0642094999.

The spelling of 25951217 in words is "twenty-five million, nine hundred fifty-one thousand, two hundred seventeen".