25649647 has 2 divisors, whose sum is σ = 25649648. Its totient is φ = 25649646.

The previous prime is 25649633. The next prime is 25649653. The reversal of 25649647 is 74694652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25649647 - 2²³ = 17261039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25649147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12824823 + 12824824.

It is an arithmetic number, because the mean of its divisors is an integer number (12824824).

Almost surely, 2^25649647 is an apocalyptic number.

25649647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25649647 is an equidigital number, since it uses as much as digits as its factorization.

25649647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The square root of 25649647 is about 5064.5480548614. The cubic root of 25649647 is about 294.9129188532.

The spelling of 25649647 in words is "twenty-five million, six hundred forty-nine thousand, six hundred forty-seven".