155986161 has 16 divisors (see below), whose sum is σ = 217313280. Its totient is φ = 99337040.

The previous prime is 155986139. The next prime is 155986177. The reversal of 155986161 is 161689551.

It is a cyclic number.

It is not a de Polignac number, because 155986161 - 2⁶ = 155986097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155986121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98506 + ... + 100076.

It is an arithmetic number, because the mean of its divisors is an integer number (13582080).

Almost surely, 2^155986161 is an apocalyptic number.

It is an amenable number.

155986161 is a deficient number, since it is larger than the sum of its proper divisors (61327119).

155986161 is a wasteful number, since it uses less digits than its factorization.

155986161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036.

The product of its digits is 64800, while the sum is 42.

The square root of 155986161 is about 12489.4419811295. The cubic root of 155986161 is about 538.3053423022.

The spelling of 155986161 in words is "one hundred fifty-five million, nine hundred eighty-six thousand, one hundred sixty-one".