145221185 has 4 divisors (see below), whose sum is σ = 174265428. Its totient is φ = 116176944.

The previous prime is 145221179. The next prime is 145221203. The reversal of 145221185 is 581122541.

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 115004176 + 30217009 = 10724^2 + 5497^2 .

It is a cyclic number.

It is not a de Polignac number, because 145221185 - 2⁴ = 145221169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14522114 + ... + 14522123.

It is an arithmetic number, because the mean of its divisors is an integer number (43566357).

Almost surely, 2^145221185 is an apocalyptic number.

It is an amenable number.

145221185 is a deficient number, since it is larger than the sum of its proper divisors (29044243).

145221185 is an equidigital number, since it uses as much as digits as its factorization.

145221185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044242.

The product of its digits is 3200, while the sum is 29.

The square root of 145221185 is about 12050.7752862627. The cubic root of 145221185 is about 525.6257813832.

The spelling of 145221185 in words is "one hundred forty-five million, two hundred twenty-one thousand, one hundred eighty-five".