22161601 has 8 divisors (see below), whose sum is σ = 27630144. Its totient is φ = 17268720.

The previous prime is 22161599. The next prime is 22161617. The reversal of 22161601 is 10616122.

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

It is not a de Polignac number, because 22161601 - 2¹ = 22161599 is a prime.

It is a super-2 number, since 2×22161601² = 982273117766402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161661) 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, 143830 + ... + 143983.

It is an arithmetic number, because the mean of its divisors is an integer number (3453768).

Almost surely, 2^22161601 is an apocalyptic number.

It is an amenable number.

22161601 is a deficient number, since it is larger than the sum of its proper divisors (5468543).

22161601 is a wasteful number, since it uses less digits than its factorization.

22161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287831.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 22161601 is about 4707.6109652349. The cubic root of 22161601 is about 280.8883393523. Note that the first 3 decimals are identical.

Adding to 22161601 its reverse (10616122), we get a palindrome (32777723).

The spelling of 22161601 in words is "twenty-two million, one hundred sixty-one thousand, six hundred one".