25226981 has 4 divisors (see below), whose sum is σ = 27167532. Its totient is φ = 23286432.

The previous prime is 25226953. The next prime is 25226983. The reversal of 25226981 is 18962252.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 22714756 = 1585^2 + 4766^2 .

It is not a de Polignac number, because 25226981 - 2¹⁰ = 25225957 is a prime.

It is a super-2 number, since 2×25226981² = 1272801140748722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25226983) 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, 970256 + ... + 970281.

It is an arithmetic number, because the mean of its divisors is an integer number (6791883).

Almost surely, 2^25226981 is an apocalyptic number.

It is an amenable number.

25226981 is a deficient number, since it is larger than the sum of its proper divisors (1940551).

25226981 is a wasteful number, since it uses less digits than its factorization.

25226981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940550.

The product of its digits is 17280, while the sum is 35.

The square root of 25226981 is about 5022.6468121898. The cubic root of 25226981 is about 293.2840377159.

The spelling of 25226981 in words is "twenty-five million, two hundred twenty-six thousand, nine hundred eighty-one".