25679561 has 4 divisors (see below), whose sum is σ = 25692624. Its totient is φ = 25666500.

The previous prime is 25679551. The next prime is 25679567. The reversal of 25679561 is 16597652.

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 25679561 - 2⁶ = 25679497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25679567) 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, 2915 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (6423156).

Almost surely, 2^25679561 is an apocalyptic number.

It is an amenable number.

25679561 is a deficient number, since it is larger than the sum of its proper divisors (13063).

25679561 is a wasteful number, since it uses less digits than its factorization.

25679561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13062.

The product of its digits is 113400, while the sum is 41.

The square root of 25679561 is about 5067.5004686729. The cubic root of 25679561 is about 295.0275220899.

The spelling of 25679561 in words is "twenty-five million, six hundred seventy-nine thousand, five hundred sixty-one".