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, and also an emirpimes, since its reverse is a distinct semiprime: 101551 = 173 ⋅587.
It is a cyclic number.
It is a Duffinian number.
It is a plaindrome in base 13 and base 16.
It is a congruent number.
2155101 is an apocalyptic number.
It is an amenable number.
155101 is an equidigital number, since it uses as much as digits as its factorization.
155101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3650.
The square root of 155101 is about 393.8286429400. The cubic root of 155101 is about 53.7285185478.
Adding to 155101 its reverse (101551), we get a palindrome (256652).
The spelling of 155101 in words is "one hundred fifty-five thousand, one hundred one".