155545 has 8 divisors (see below), whose sum is σ = 201096. Its totient is φ = 114816.

The previous prime is 155539. The next prime is 155557. The reversal of 155545 is 545551.

It can be written as a sum of positive squares in 4 ways, for example, as 5776 + 149769 = 76^2 + 387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155545 - 2³ = 155537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1132 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (25137).

155545 is a Friedman number, since it can be written as 5*(5+4*(5+1)^5), using all its digits and the basic arithmetic operations.

2¹⁵⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

155545 is a deficient number, since it is larger than the sum of its proper divisors (45551).

155545 is a wasteful number, since it uses less digits than its factorization.

155545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its digits is 2500, while the sum is 25.

The square root of 155545 is about 394.3919370373. The cubic root of 155545 is about 53.7797383660.

It can be divided in two parts, 1555 and 45, that added together give a square (1600 = 40²).

The spelling of 155545 in words is "one hundred fifty-five thousand, five hundred forty-five".