145541689 has 4 divisors (see below), whose sum is σ = 145568500. Its totient is φ = 145514880.

The previous prime is 145541663. The next prime is 145541701. The reversal of 145541689 is 986145541.

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 75986089 + 69555600 = 8717^2 + 8340^2 .

It is a cyclic number.

It is not a de Polignac number, because 145541689 - 2⁹ = 145541177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145541629) by changing a digit.

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, 2064 + ... + 17185.

It is an arithmetic number, because the mean of its divisors is an integer number (36392125).

Almost surely, 2^145541689 is an apocalyptic number.

It is an amenable number.

145541689 is a deficient number, since it is larger than the sum of its proper divisors (26811).

145541689 is an equidigital number, since it uses as much as digits as its factorization.

145541689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26810.

The product of its digits is 172800, while the sum is 43.

The square root of 145541689 is about 12064.0660226973. The cubic root of 145541689 is about 526.0121836441.

The spelling of 145541689 in words is "one hundred forty-five million, five hundred forty-one thousand, six hundred eighty-nine".