22001545 has 4 divisors (see below), whose sum is σ = 26401860. Its totient is φ = 17601232.

The previous prime is 22001533. The next prime is 22001597. The reversal of 22001545 is 54510022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4787344 + 17214201 = 2188^2 + 4149^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001545 - 2⁹ = 22001033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2200150 + ... + 2200159.

It is an arithmetic number, because the mean of its divisors is an integer number (6600465).

Almost surely, 2^22001545 is an apocalyptic number.

It is an amenable number.

22001545 is a deficient number, since it is larger than the sum of its proper divisors (4400315).

22001545 is an equidigital number, since it uses as much as digits as its factorization.

22001545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400314.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 22001545 is about 4690.5804544854. The cubic root of 22001545 is about 280.2104922313.

Adding to 22001545 its reverse (54510022), we get a palindrome (76511567).

The spelling of 22001545 in words is "twenty-two million, one thousand, five hundred forty-five".