22161325 has 6 divisors (see below), whose sum is σ = 27480074. Its totient is φ = 17729040.

The previous prime is 22161313. The next prime is 22161331. The reversal of 22161325 is 52316122.

It can be written as a sum of positive squares in 3 ways, for example, as 5476 + 22155849 = 74^2 + 4707^2 .

It is not a de Polignac number, because 22161325 - 2²¹ = 20064173 is a prime.

It is a super-2 number, since 2×22161325² = 982248651511250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22161296 and 22161305.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 443202 + ... + 443251.

Almost surely, 2^22161325 is an apocalyptic number.

22161325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22161325 is a deficient number, since it is larger than the sum of its proper divisors (5318749).

22161325 is an equidigital number, since it uses as much as digits as its factorization.

22161325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886463 (or 886458 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 22161325 is about 4707.5816509116. The cubic root of 22161325 is about 280.8871732887.

Adding to 22161325 its reverse (52316122), we get a palindrome (74477447).

The spelling of 22161325 in words is "twenty-two million, one hundred sixty-one thousand, three hundred twenty-five".