22161545 has 8 divisors (see below), whose sum is σ = 30393024. Its totient is φ = 15196464.

The previous prime is 22161533. The next prime is 22161547. The reversal of 22161545 is 54516122.

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 22161545 - 2⁸ = 22161289 is a prime.

It is a super-2 number, since 2×22161545² = 982268153574050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161547) 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, 316559 + ... + 316628.

It is an arithmetic number, because the mean of its divisors is an integer number (3799128).

Almost surely, 2^22161545 is an apocalyptic number.

It is an amenable number.

22161545 is a deficient number, since it is larger than the sum of its proper divisors (8231479).

22161545 is an equidigital number, since it uses as much as digits as its factorization.

22161545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633199.

The product of its digits is 2400, while the sum is 26.

The square root of 22161545 is about 4707.6050174160. The cubic root of 22161545 is about 280.8881027605. Note that the first 3 decimals are identical.

Adding to 22161545 its reverse (54516122), we get a palindrome (76677667).

The spelling of 22161545 in words is "twenty-two million, one hundred sixty-one thousand, five hundred forty-five".