155860109 has 8 divisors (see below), whose sum is σ = 158311800. Its totient is φ = 153427456.

The previous prime is 155860099. The next prime is 155860163. The reversal of 155860109 is 901068551.

It can be written as a sum of positive squares in 4 ways, for example, as 25786084 + 130074025 = 5078^2 + 11405^2 .

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 155860109 - 2¹² = 155856013 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 (155860409) 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 7 ways as a sum of consecutive naturals, for example, 12209 + ... + 21465.

It is an arithmetic number, because the mean of its divisors is an integer number (19788975).

Almost surely, 2^155860109 is an apocalyptic number.

It is an amenable number.

155860109 is a deficient number, since it is larger than the sum of its proper divisors (2451691).

155860109 is a wasteful number, since it uses less digits than its factorization.

155860109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9519.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 155860109 is about 12484.3946188832. The cubic root of 155860109 is about 538.1603021900.

The spelling of 155860109 in words is "one hundred fifty-five million, eight hundred sixty thousand, one hundred nine".