155945 has 4 divisors (see below), whose sum is σ = 187140. Its totient is φ = 124752.

The previous prime is 155921. The next prime is 156007. The reversal of 155945 is 549551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32041 + 123904 = 179^2 + 352^2 .

It is a cyclic number.

It is not a de Polignac number, because 155945 - 2⁸ = 155689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15590 + ... + 15599.

It is an arithmetic number, because the mean of its divisors is an integer number (46785).

2¹⁵⁵⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

155945 is a deficient number, since it is larger than the sum of its proper divisors (31195).

155945 is an equidigital number, since it uses as much as digits as its factorization.

155945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31194.

The product of its digits is 4500, while the sum is 29.

The square root of 155945 is about 394.8987211932. The cubic root of 155945 is about 53.8257989522.

The spelling of 155945 in words is "one hundred fifty-five thousand, nine hundred forty-five".