155775 has 24 divisors (see below), whose sum is σ = 269824. Its totient is φ = 79200.

The previous prime is 155773. The next prime is 155777. The reversal of 155775 is 577551.

It is an interprime number because it is at equal distance from previous prime (155773) and next prime (155777).

It is not a de Polignac number, because 155775 - 2¹ = 155773 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2292 + ... + 2358.

2¹⁵⁵⁷⁷⁵ is an apocalyptic number.

155775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155775 is a deficient number, since it is larger than the sum of its proper divisors (114049).

155775 is a wasteful number, since it uses less digits than its factorization.

155775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 106 counting only the distinct ones).

The product of its digits is 6125, while the sum is 30.

The square root of 155775 is about 394.6834174373. The cubic root of 155775 is about 53.8062328383.

The spelling of 155775 in words is "one hundred fifty-five thousand, seven hundred seventy-five".