155365 has 16 divisors (see below), whose sum is σ = 223488. Its totient is φ = 101376.

The previous prime is 155333. The next prime is 155371. The reversal of 155365 is 563551.

It is a 5-Lehmer number, since φ(155365) divides (155365-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 155365 - 2⁵ = 155333 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 709 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (13968).

2¹⁵⁵³⁶⁵ is an apocalyptic number.

155365 is the 322-nd pentagonal number.

It is an amenable number.

155365 is a deficient number, since it is larger than the sum of its proper divisors (68123).

155365 is a wasteful number, since it uses less digits than its factorization.

155365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 2250, while the sum is 25.

The square root of 155365 is about 394.1636715883. The cubic root of 155365 is about 53.7589853376.

The spelling of 155365 in words is "one hundred fifty-five thousand, three hundred sixty-five".