155597 has 4 divisors (see below), whose sum is σ = 167580. Its totient is φ = 143616.

The previous prime is 155593. The next prime is 155599. The reversal of 155597 is 795551.

155597 is nontrivially palindromic in base 3.

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 17956 + 137641 = 134^2 + 371^2 .

It is a cyclic number.

It is not a de Polignac number, because 155597 - 2² = 155593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155597.

It is not an unprimeable number, because it can be changed into a prime (155593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5972 + ... + 5997.

It is an arithmetic number, because the mean of its divisors is an integer number (41895).

2¹⁵⁵⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

155597 is a deficient number, since it is larger than the sum of its proper divisors (11983).

155597 is a wasteful number, since it uses less digits than its factorization.

155597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11982.

The product of its digits is 7875, while the sum is 32.

The square root of 155597 is about 394.4578557970. The cubic root of 155597 is about 53.7857307044.

The spelling of 155597 in words is "one hundred fifty-five thousand, five hundred ninety-seven".