145663909 has 4 divisors (see below), whose sum is σ = 145884940. Its totient is φ = 145442880.

The previous prime is 145663907. The next prime is 145663943. The reversal of 145663909 is 909366541.

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 80102500 + 65561409 = 8950^2 + 8097^2 .

It is a cyclic number.

It is not a de Polignac number, because 145663909 - 2¹ = 145663907 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 (145663907) 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, 109524 + ... + 110845.

It is an arithmetic number, because the mean of its divisors is an integer number (36471235).

Almost surely, 2^145663909 is an apocalyptic number.

It is an amenable number.

145663909 is a deficient number, since it is larger than the sum of its proper divisors (221031).

145663909 is an equidigital number, since it uses as much as digits as its factorization.

145663909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221030.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 145663909 is about 12069.1304160656. The cubic root of 145663909 is about 526.1593836711.

The spelling of 145663909 in words is "one hundred forty-five million, six hundred sixty-three thousand, nine hundred nine".