25517207 has 2 divisors, whose sum is σ = 25517208. Its totient is φ = 25517206.

The previous prime is 25517201. The next prime is 25517251. The reversal of 25517207 is 70271552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25517207 - 2⁸ = 25516951 is a prime.

It is a super-2 number, since 2×25517207² = 1302255706161698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25517207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25517201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758603 + 12758604.

It is an arithmetic number, because the mean of its divisors is an integer number (12758604).

Almost surely, 2^25517207 is an apocalyptic number.

25517207 is a deficient number, since it is larger than the sum of its proper divisors (1).

25517207 is an equidigital number, since it uses as much as digits as its factorization.

25517207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 25517207 is about 5051.4559287398. The cubic root of 25517207 is about 294.4044559066.

Adding to 25517207 its reverse (70271552), we get a palindrome (95788759).

The spelling of 25517207 in words is "twenty-five million, five hundred seventeen thousand, two hundred seven".