25999801 has 3 divisors (see below), whose sum is σ = 26004901. Its totient is φ = 25994702.

The previous prime is 25999751. The next prime is 25999807. The reversal of 25999801 is 10899952.

The square root of 25999801 is 5099.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-25999801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25999807) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2550 + ... + 7648.

Almost surely, 2^25999801 is an apocalyptic number.

25999801 is the 5099-th square number.

25999801 is the 2550-th centered octagonal number.

It is an amenable number.

25999801 is a deficient number, since it is larger than the sum of its proper divisors (5100).

25999801 is an frugal number, since it uses more digits than its factorization.

25999801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10198 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The cubic root of 25999801 is about 296.2488510225.

The spelling of 25999801 in words is "twenty-five million, nine hundred ninety-nine thousand, eight hundred one".