155601 has 20 divisors (see below), whose sum is σ = 248292. Its totient is φ = 96768.

The previous prime is 155599. The next prime is 155609. The reversal of 155601 is 106551.

It can be written as a sum of positive squares in 2 ways, for example, as 50625 + 104976 = 225^2 + 324^2 .

It is not a de Polignac number, because 155601 - 2¹ = 155599 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155601.

It is not an unprimeable number, because it can be changed into a prime (155609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1321 + ... + 1433.

2¹⁵⁵⁶⁰¹ is an apocalyptic number.

It is an amenable number.

155601 is a deficient number, since it is larger than the sum of its proper divisors (92691).

155601 is a wasteful number, since it uses less digits than its factorization.

155601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 155601 is about 394.4629260146. The cubic root of 155601 is about 53.7861915982.

The spelling of 155601 in words is "one hundred fifty-five thousand, six hundred one".