22161505 has 8 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 16796016.

The previous prime is 22161499. The next prime is 22161509. The reversal of 22161505 is 50516122.

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 22161505 - 2⁹ = 22160993 is a prime.

It is a super-2 number, since 2×22161505² = 982264607730050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116545 + ... + 116734.

It is an arithmetic number, because the mean of its divisors is an integer number (3499200).

Almost surely, 2^22161505 is an apocalyptic number.

It is an amenable number.

22161505 is a deficient number, since it is larger than the sum of its proper divisors (5832095).

22161505 is a wasteful number, since it uses less digits than its factorization.

22161505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233303.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 22161505 is about 4707.6007689693. The cubic root of 22161505 is about 280.8879337661.

Adding to 22161505 its reverse (50516122), we get a palindrome (72677627).

It can be divided in two parts, 2216 and 1505, that added together give a square (3721 = 61²).

The spelling of 22161505 in words is "twenty-two million, one hundred sixty-one thousand, five hundred five".