25860551 has 4 divisors (see below), whose sum is σ = 25935000. Its totient is φ = 25786104.

The previous prime is 25860529. The next prime is 25860599. The reversal of 25860551 is 15506852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25860551 - 2¹⁸ = 25598407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25860251) 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 in 3 ways as a sum of consecutive naturals, for example, 36701 + ... + 37398.

It is an arithmetic number, because the mean of its divisors is an integer number (6483750).

Almost surely, 2^25860551 is an apocalyptic number.

25860551 is a deficient number, since it is larger than the sum of its proper divisors (74449).

25860551 is an equidigital number, since it uses as much as digits as its factorization.

25860551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74448.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 25860551 is about 5085.3270297986. The cubic root of 25860551 is about 295.7190197935.

The spelling of 25860551 in words is "twenty-five million, eight hundred sixty thousand, five hundred fifty-one".