145223165 has 4 divisors (see below), whose sum is σ = 174267804. Its totient is φ = 116178528.

The previous prime is 145223149. The next prime is 145223179. The reversal of 145223165 is 561322541.

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 24970009 + 120253156 = 4997^2 + 10966^2 .

It is a cyclic number.

It is not a de Polignac number, because 145223165 - 2⁴ = 145223149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14522312 + ... + 14522321.

It is an arithmetic number, because the mean of its divisors is an integer number (43566951).

Almost surely, 2^145223165 is an apocalyptic number.

It is an amenable number.

145223165 is a deficient number, since it is larger than the sum of its proper divisors (29044639).

145223165 is an equidigital number, since it uses as much as digits as its factorization.

145223165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044638.

The product of its digits is 7200, while the sum is 29.

The square root of 145223165 is about 12050.8574383734. The cubic root of 145223165 is about 525.6281702319.

The spelling of 145223165 in words is "one hundred forty-five million, two hundred twenty-three thousand, one hundred sixty-five".