155805241 has 4 divisors (see below), whose sum is σ = 155830500. Its totient is φ = 155779984.

The previous prime is 155805229. The next prime is 155805257. The reversal of 155805241 is 142508551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142508551 = 3307 ⋅43093.

It can be written as a sum of positive squares in 2 ways, for example, as 141705216 + 14100025 = 11904^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 155805241 - 2¹³ = 155797049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155805271) 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 3 ways as a sum of consecutive naturals, for example, 3435 + ... + 17983.

It is an arithmetic number, because the mean of its divisors is an integer number (38957625).

Almost surely, 2^155805241 is an apocalyptic number.

It is an amenable number.

155805241 is a deficient number, since it is larger than the sum of its proper divisors (25259).

155805241 is a wasteful number, since it uses less digits than its factorization.

155805241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25258.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 155805241 is about 12482.1969620736. The cubic root of 155805241 is about 538.0971446033.

The spelling of 155805241 in words is "one hundred fifty-five million, eight hundred five thousand, two hundred forty-one".