155587 has 4 divisors (see below), whose sum is σ = 156736. Its totient is φ = 154440.

The previous prime is 155581. The next prime is 155593. The reversal of 155587 is 785551.

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: 785551 = 13 ⋅60427.

It is an interprime number because it is at equal distance from previous prime (155581) and next prime (155593).

It is a cyclic number.

It is not a de Polignac number, because 155587 - 2³ = 155579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155581) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 339 + ... + 652.

It is an arithmetic number, because the mean of its divisors is an integer number (39184).

2¹⁵⁵⁵⁸⁷ is an apocalyptic number.

155587 is a deficient number, since it is larger than the sum of its proper divisors (1149).

155587 is an equidigital number, since it uses as much as digits as its factorization.

155587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its digits is 7000, while the sum is 31.

The square root of 155587 is about 394.4451799680. The cubic root of 155587 is about 53.7845784353.

The spelling of 155587 in words is "one hundred fifty-five thousand, five hundred eighty-seven".