25781207 has 2 divisors, whose sum is σ = 25781208. Its totient is φ = 25781206.

The previous prime is 25781177. The next prime is 25781213. The reversal of 25781207 is 70218752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25781207 - 2⁶ = 25781143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25781227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12890603 + 12890604.

It is an arithmetic number, because the mean of its divisors is an integer number (12890604).

Almost surely, 2^25781207 is an apocalyptic number.

25781207 is a deficient number, since it is larger than the sum of its proper divisors (1).

25781207 is an equidigital number, since it uses as much as digits as its factorization.

25781207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 25781207 is about 5077.5197685484. The cubic root of 25781207 is about 295.4162733772.

Adding to 25781207 its reverse (70218752), we get a palindrome (95999959).

The spelling of 25781207 in words is "twenty-five million, seven hundred eighty-one thousand, two hundred seven".