25222161 has 4 divisors (see below), whose sum is σ = 33629552. Its totient is φ = 16814772.

The previous prime is 25222159. The next prime is 25222181. The reversal of 25222161 is 16122252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25222161 - 2¹ = 25222159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25222121) 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, 4203691 + ... + 4203696.

It is an arithmetic number, because the mean of its divisors is an integer number (8407388).

Almost surely, 2^25222161 is an apocalyptic number.

It is an amenable number.

25222161 is a deficient number, since it is larger than the sum of its proper divisors (8407391).

25222161 is an equidigital number, since it uses as much as digits as its factorization.

25222161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8407390.

The product of its digits is 480, while the sum is 21.

The square root of 25222161 is about 5022.1669625770. The cubic root of 25222161 is about 293.2653577280.

Subtracting from 25222161 its reverse (16122252), we obtain a palindrome (9099909).

The spelling of 25222161 in words is "twenty-five million, two hundred twenty-two thousand, one hundred sixty-one".