25551217 has 2 divisors, whose sum is σ = 25551218. Its totient is φ = 25551216.

The previous prime is 25551193. The next prime is 25551263. The reversal of 25551217 is 71215552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 8708401 = 4104^2 + 2951^2 .

It is a cyclic number.

It is not a de Polignac number, because 25551217 - 2¹¹ = 25549169 is a prime.

It is not a weakly prime, because it can be changed into another prime (25551287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775608 + 12775609.

It is an arithmetic number, because the mean of its divisors is an integer number (12775609).

Almost surely, 2^25551217 is an apocalyptic number.

It is an amenable number.

25551217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551217 is an equidigital number, since it uses as much as digits as its factorization.

25551217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3500, while the sum is 28.

The square root of 25551217 is about 5054.8211639978. The cubic root of 25551217 is about 294.5351944895.

Adding to 25551217 its reverse (71215552), we get a palindrome (96766769).

The spelling of 25551217 in words is "twenty-five million, five hundred fifty-one thousand, two hundred seventeen".