25071643 has 2 divisors, whose sum is σ = 25071644. Its totient is φ = 25071642.

The previous prime is 25071619. The next prime is 25071647. The reversal of 25071643 is 34617052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25071643 - 2⁵ = 25071611 is a prime.

It is not a weakly prime, because it can be changed into another prime (25071647) 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, 12535821 + 12535822.

It is an arithmetic number, because the mean of its divisors is an integer number (12535822).

Almost surely, 2^25071643 is an apocalyptic number.

25071643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25071643 is an equidigital number, since it uses as much as digits as its factorization.

25071643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 25071643 is about 5007.1591746219. The cubic root of 25071643 is about 292.6808213039.

Adding to 25071643 its reverse (34617052), we get a palindrome (59688695).

The spelling of 25071643 in words is "twenty-five million, seventy-one thousand, six hundred forty-three".