145232209 has 8 divisors (see below), whose sum is σ = 151941888. Its totient is φ = 138673440.

The previous prime is 145232201. The next prime is 145232221. The reversal of 145232209 is 902232541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145232209 - 2³ = 145232201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145232201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35757 + ... + 39610.

It is an arithmetic number, because the mean of its divisors is an integer number (18992736).

Almost surely, 2^145232209 is an apocalyptic number.

It is an amenable number.

145232209 is a deficient number, since it is larger than the sum of its proper divisors (6709679).

145232209 is an equidigital number, since it uses as much as digits as its factorization.

145232209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75455.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 145232209 is about 12051.2326755399. The cubic root of 145232209 is about 525.6390814445.

The spelling of 145232209 in words is "one hundred forty-five million, two hundred thirty-two thousand, two hundred nine".