145223227 has 4 divisors (see below), whose sum is σ = 145252440. Its totient is φ = 145194016.

The previous prime is 145223203. The next prime is 145223257. The reversal of 145223227 is 722322541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722322541 = 19813 ⋅36457.

It is a cyclic number.

It is not a de Polignac number, because 145223227 - 2¹¹ = 145221179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145223195 and 145223204.

It is not an unprimeable number, because it can be changed into a prime (145223257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5077 + ... + 17782.

It is an arithmetic number, because the mean of its divisors is an integer number (36313110).

Almost surely, 2^145223227 is an apocalyptic number.

145223227 is a deficient number, since it is larger than the sum of its proper divisors (29213).

145223227 is an equidigital number, since it uses as much as digits as its factorization.

145223227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29212.

The product of its digits is 6720, while the sum is 28.

The square root of 145223227 is about 12050.8600108042. The cubic root of 145223227 is about 525.6282450339.

Adding to 145223227 its reverse (722322541), we get a palindrome (867545768).

The spelling of 145223227 in words is "one hundred forty-five million, two hundred twenty-three thousand, two hundred twenty-seven".