25691047 has 2 divisors, whose sum is σ = 25691048. Its totient is φ = 25691046.

The previous prime is 25691041. The next prime is 25691077. The reversal of 25691047 is 74019652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25691047 - 2¹⁹ = 25166759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25691041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845523 + 12845524.

It is an arithmetic number, because the mean of its divisors is an integer number (12845524).

Almost surely, 2^25691047 is an apocalyptic number.

25691047 is a deficient number, since it is larger than the sum of its proper divisors (1).

25691047 is an equidigital number, since it uses as much as digits as its factorization.

25691047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 25691047 is about 5068.6336423143. The cubic root of 25691047 is about 295.0715023461.

The spelling of 25691047 in words is "twenty-five million, six hundred ninety-one thousand, forty-seven".