155015109 has 6 divisors (see below), whose sum is σ = 223910726. Its totient is φ = 103343400.

The previous prime is 155015041. The next prime is 155015111. The reversal of 155015109 is 901510551.

155015109 is a `hidden beast` number, since 1 + 550 + 1 + 5 + 109 = 666.

It can be written as a sum of positive squares in only one way, i.e., 134792100 + 20223009 = 11610^2 + 4497^2 .

It is a de Polignac number, because none of the positive numbers 2^k-155015109 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 (155013109) 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, 8611942 + ... + 8611959.

Almost surely, 2^155015109 is an apocalyptic number.

It is an amenable number.

155015109 is a deficient number, since it is larger than the sum of its proper divisors (68895617).

155015109 is a wasteful number, since it uses less digits than its factorization.

155015109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17223907 (or 17223904 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The square root of 155015109 is about 12450.5063752443. The cubic root of 155015109 is about 537.1859888616.

The spelling of 155015109 in words is "one hundred fifty-five million, fifteen thousand, one hundred nine".