155099 has 4 divisors (see below), whose sum is σ = 177264. Its totient is φ = 132936.

The previous prime is 155087. The next prime is 155119. The reversal of 155099 is 990551.

155099 = T₂₀₇ + T₂₀₈ + ... + T₂₁₃.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155099 - 2⁴ = 155083 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (155009) 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, 11072 + ... + 11085.

It is an arithmetic number, because the mean of its divisors is an integer number (44316).

2¹⁵⁵⁰⁹⁹ is an apocalyptic number.

155099 is a deficient number, since it is larger than the sum of its proper divisors (22165).

155099 is an equidigital number, since it uses as much as digits as its factorization.

155099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22164.

The product of its (nonzero) digits is 2025, while the sum is 29.

The square root of 155099 is about 393.8261037565. The cubic root of 155099 is about 53.7282876068.

The spelling of 155099 in words is "one hundred fifty-five thousand, ninety-nine".