145222223 has 4 divisors (see below), whose sum is σ = 148599528. Its totient is φ = 141844920.

The previous prime is 145222201. The next prime is 145222237. The reversal of 145222223 is 322222541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322222541 = 59 ⋅5461399.

It is a cyclic number.

It is not a de Polignac number, because 145222223 - 2¹⁴ = 145205839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145222243) 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, 1688588 + ... + 1688673.

It is an arithmetic number, because the mean of its divisors is an integer number (37149882).

Almost surely, 2^145222223 is an apocalyptic number.

145222223 is a deficient number, since it is larger than the sum of its proper divisors (3377305).

145222223 is an equidigital number, since it uses as much as digits as its factorization.

145222223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377304.

The product of its digits is 1920, while the sum is 23.

The square root of 145222223 is about 12050.8183539542. The cubic root of 145222223 is about 525.6270337218.

Adding to 145222223 its reverse (322222541), we get a palindrome (467444764).

The spelling of 145222223 in words is "one hundred forty-five million, two hundred twenty-two thousand, two hundred twenty-three".