15222145 has 4 divisors (see below), whose sum is σ = 18266580. Its totient is φ = 12177712.

The previous prime is 15222143. The next prime is 15222197. The reversal of 15222145 is 54122251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54122251 = 43 ⋅1258657.

It can be written as a sum of positive squares in 2 ways, for example, as 10452289 + 4769856 = 3233^2 + 2184^2 .

It is a cyclic number.

It is not a de Polignac number, because 15222145 - 2¹ = 15222143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15222143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522210 + ... + 1522219.

It is an arithmetic number, because the mean of its divisors is an integer number (4566645).

Almost surely, 2^15222145 is an apocalyptic number.

It is an amenable number.

15222145 is a deficient number, since it is larger than the sum of its proper divisors (3044435).

15222145 is an equidigital number, since it uses as much as digits as its factorization.

15222145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044434.

The product of its digits is 800, while the sum is 22.

The square root of 15222145 is about 3901.5567405845. The cubic root of 15222145 is about 247.8327056346.

Adding to 15222145 its reverse (54122251), we get a palindrome (69344396).

The spelling of 15222145 in words is "fifteen million, two hundred twenty-two thousand, one hundred forty-five".