155987161 has 8 divisors (see below), whose sum is σ = 171033984. Its totient is φ = 141084720.

The previous prime is 155987149. The next prime is 155987177. The reversal of 155987161 is 161789551.

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 155987161 - 2⁷ = 155987033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155987191) 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, 33825 + ... + 38158.

It is an arithmetic number, because the mean of its divisors is an integer number (21379248).

Almost surely, 2^155987161 is an apocalyptic number.

155987161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155987161 is a deficient number, since it is larger than the sum of its proper divisors (15046823).

155987161 is a wasteful number, since it uses less digits than its factorization.

155987161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72191.

The product of its digits is 75600, while the sum is 43.

The square root of 155987161 is about 12489.4820148796. The cubic root of 155987161 is about 538.3064926269.

The spelling of 155987161 in words is "one hundred fifty-five million, nine hundred eighty-seven thousand, one hundred sixty-one".