25198281 has 6 divisors (see below), whose sum is σ = 36397530. Its totient is φ = 16798848.

The previous prime is 25198279. The next prime is 25198289. The reversal of 25198281 is 18289152.

It can be written as a sum of positive squares in only one way, i.e., 25160256 + 38025 = 5016^2 + 195^2 .

It is not a de Polignac number, because 25198281 - 2¹ = 25198279 is a prime.

It is a super-2 number, since 2×25198281² = 1269906730709922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25198289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1399896 + ... + 1399913.

It is an arithmetic number, because the mean of its divisors is an integer number (6066255).

Almost surely, 2^25198281 is an apocalyptic number.

It is an amenable number.

25198281 is a deficient number, since it is larger than the sum of its proper divisors (11199249).

25198281 is a wasteful number, since it uses less digits than its factorization.

25198281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799815 (or 2799812 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 25198281 is about 5019.7889397862. The cubic root of 25198281 is about 293.1727752820.

The spelling of 25198281 in words is "twenty-five million, one hundred ninety-eight thousand, two hundred eighty-one".