22161365 has 8 divisors (see below), whose sum is σ = 27510840. Its totient is φ = 17117632.

The previous prime is 22161343. The next prime is 22161371. The reversal of 22161365 is 56316122.

It can be written as a sum of positive squares in 4 ways, for example, as 268324 + 21893041 = 518^2 + 4679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22161365 - 2⁸ = 22161109 is a prime.

It is a super-2 number, since 2×22161365² = 982252197326450, which contains 22 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 76274 + ... + 76563.

It is an arithmetic number, because the mean of its divisors is an integer number (3438855).

Almost surely, 2^22161365 is an apocalyptic number.

It is an amenable number.

22161365 is a deficient number, since it is larger than the sum of its proper divisors (5349475).

22161365 is a wasteful number, since it uses less digits than its factorization.

22161365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152871.

The product of its digits is 2160, while the sum is 26.

The square root of 22161365 is about 4707.5858993756. The cubic root of 22161365 is about 280.8873422841.

Adding to 22161365 its reverse (56316122), we get a palindrome (78477487).

The spelling of 22161365 in words is "twenty-two million, one hundred sixty-one thousand, three hundred sixty-five".