145717189 has 4 divisors (see below), whose sum is σ = 145742380. Its totient is φ = 145692000.

The previous prime is 145717129. The next prime is 145717219. The reversal of 145717189 is 981717541.

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 46376100 + 99341089 = 6810^2 + 9967^2 .

It is a cyclic number.

It is not a de Polignac number, because 145717189 - 2¹⁷ = 145586117 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 (145717129) 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, 907 + ... + 17095.

It is an arithmetic number, because the mean of its divisors is an integer number (36435595).

Almost surely, 2^145717189 is an apocalyptic number.

It is an amenable number.

145717189 is a deficient number, since it is larger than the sum of its proper divisors (25191).

145717189 is an equidigital number, since it uses as much as digits as its factorization.

145717189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25190.

The product of its digits is 70560, while the sum is 43.

The square root of 145717189 is about 12071.3374983885. The cubic root of 145717189 is about 526.2235275734.

The spelling of 145717189 in words is "one hundred forty-five million, seven hundred seventeen thousand, one hundred eighty-nine".