155129 has 4 divisors (see below), whose sum is σ = 167076. Its totient is φ = 143184.

The previous prime is 155119. The next prime is 155137. The reversal of 155129 is 921551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921551 = 953 ⋅967.

It can be written as a sum of positive squares in 2 ways, for example, as 76729 + 78400 = 277^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 155129 - 2⁸ = 154873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155119) 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, 5954 + ... + 5979.

It is an arithmetic number, because the mean of its divisors is an integer number (41769).

2¹⁵⁵¹²⁹ is an apocalyptic number.

It is an amenable number.

155129 is a deficient number, since it is larger than the sum of its proper divisors (11947).

155129 is a wasteful number, since it uses less digits than its factorization.

155129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11946.

The product of its digits is 450, while the sum is 23.

The square root of 155129 is about 393.8641897914. The cubic root of 155129 is about 53.7317515121.

The spelling of 155129 in words is "one hundred fifty-five thousand, one hundred twenty-nine".