155085509 has 8 divisors (see below), whose sum is σ = 164643840. Its totient is φ = 145575616.

The previous prime is 155085461. The next prime is 155085517. The reversal of 155085509 is 905580551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155085509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155085559) 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, 5399 + ... + 18420.

It is an arithmetic number, because the mean of its divisors is an integer number (20580480).

Almost surely, 2^155085509 is an apocalyptic number.

It is an amenable number.

155085509 is a deficient number, since it is larger than the sum of its proper divisors (9558331).

155085509 is a wasteful number, since it uses less digits than its factorization.

155085509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24219.

The product of its (nonzero) digits is 45000, while the sum is 38.

The square root of 155085509 is about 12453.3332485724. Note that the first 3 decimals coincide. The cubic root of 155085509 is about 537.2672974306.

The spelling of 155085509 in words is "one hundred fifty-five million, eighty-five thousand, five hundred nine".