155185009 has 6 divisors (see below), whose sum is σ = 180521394. Its totient is φ = 133015680.

The previous prime is 155185001. The next prime is 155185033. The reversal of 155185009 is 900581551.

It can be written as a sum of positive squares in only one way, i.e., 147501025 + 7683984 = 12145^2 + 2772^2 .

It is not a de Polignac number, because 155185009 - 2³ = 155185001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155185001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1583472 + ... + 1583569.

It is an arithmetic number, because the mean of its divisors is an integer number (30086899).

Almost surely, 2^155185009 is an apocalyptic number.

It is an amenable number.

155185009 is a deficient number, since it is larger than the sum of its proper divisors (25336385).

155185009 is an equidigital number, since it uses as much as digits as its factorization.

155185009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167055 (or 3167048 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 34.

The square root of 155185009 is about 12457.3275223862. The cubic root of 155185009 is about 537.3821731271.

The spelling of 155185009 in words is "one hundred fifty-five million, one hundred eighty-five thousand, nine".