25997851 has 4 divisors (see below), whose sum is σ = 28361304. Its totient is φ = 23634400.

The previous prime is 25997849. The next prime is 25997861. The reversal of 25997851 is 15879952.

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 25997851 - 2¹ = 25997849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25997801) 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, 1181710 + ... + 1181731.

It is an arithmetic number, because the mean of its divisors is an integer number (7090326).

Almost surely, 2^25997851 is an apocalyptic number.

25997851 is a deficient number, since it is larger than the sum of its proper divisors (2363453).

25997851 is a wasteful number, since it uses less digits than its factorization.

25997851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363452.

The product of its digits is 226800, while the sum is 46.

The square root of 25997851 is about 5098.8087824511. The cubic root of 25997851 is about 296.2414445594.

The spelling of 25997851 in words is "twenty-five million, nine hundred ninety-seven thousand, eight hundred fifty-one".