155969109 has 6 divisors (see below), whose sum is σ = 225288726. Its totient is φ = 103979400.

The previous prime is 155969083. The next prime is 155969117. The reversal of 155969109 is 901969551.

It is a happy number.

155969109 is a `hidden beast` number, since 1 + 559 + 6 + 91 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 118330884 + 37638225 = 10878^2 + 6135^2 .

It is not a de Polignac number, because 155969109 - 2²⁰ = 154920533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155969129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8664942 + ... + 8664959.

It is an arithmetic number, because the mean of its divisors is an integer number (37548121).

Almost surely, 2^155969109 is an apocalyptic number.

It is an amenable number.

155969109 is a deficient number, since it is larger than the sum of its proper divisors (69319617).

155969109 is a wasteful number, since it uses less digits than its factorization.

155969109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17329907 (or 17329904 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 155969109 is about 12488.7593058718. The cubic root of 155969109 is about 538.2857262091.

The spelling of 155969109 in words is "one hundred fifty-five million, nine hundred sixty-nine thousand, one hundred nine".