25601649 has 4 divisors (see below), whose sum is σ = 34135536. Its totient is φ = 17067764.

The previous prime is 25601647. The next prime is 25601657. The reversal of 25601649 is 94610652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25601649 - 2¹ = 25601647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25601647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266939 + ... + 4266944.

It is an arithmetic number, because the mean of its divisors is an integer number (8533884).

Almost surely, 2^25601649 is an apocalyptic number.

It is an amenable number.

25601649 is a deficient number, since it is larger than the sum of its proper divisors (8533887).

25601649 is an equidigital number, since it uses as much as digits as its factorization.

25601649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533886.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 25601649 is about 5059.8072097660. The cubic root of 25601649 is about 294.7288478470.

The spelling of 25601649 in words is "twenty-five million, six hundred one thousand, six hundred forty-nine".