155581201 has 8 divisors (see below), whose sum is σ = 161113320. Its totient is φ = 150060288.

The previous prime is 155581187. The next prime is 155581207. The reversal of 155581201 is 102185551.

155581201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6130576 + 149450625 = 2476^2 + 12225^2 .

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 155581201 - 2⁷ = 155581073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155581201.

It is not an unprimeable number, because it can be changed into a prime (155581207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33705 + ... + 38041.

It is an arithmetic number, because the mean of its divisors is an integer number (20139165).

Almost surely, 2^155581201 is an apocalyptic number.

It is an amenable number.

155581201 is a deficient number, since it is larger than the sum of its proper divisors (5532119).

155581201 is a wasteful number, since it uses less digits than its factorization.

155581201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 155581201 is about 12473.2193518754. The cubic root of 155581201 is about 537.8391021185.

The spelling of 155581201 in words is "one hundred fifty-five million, five hundred eighty-one thousand, two hundred one".