155897 has 4 divisors (see below), whose sum is σ = 178176. Its totient is φ = 133620.

The previous prime is 155893. The next prime is 155921. The reversal of 155897 is 798551.

155897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155897 - 2² = 155893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155891) 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, 11129 + ... + 11142.

It is an arithmetic number, because the mean of its divisors is an integer number (44544).

2¹⁵⁵⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

155897 is a deficient number, since it is larger than the sum of its proper divisors (22279).

155897 is an equidigital number, since it uses as much as digits as its factorization.

155897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22278.

The product of its digits is 12600, while the sum is 35.

The square root of 155897 is about 394.8379414393. The cubic root of 155897 is about 53.8202758436.

The spelling of 155897 in words is "one hundred fifty-five thousand, eight hundred ninety-seven".