505550121 has 4 divisors (see below), whose sum is σ = 674066832. Its totient is φ = 337033412.

The previous prime is 505550099. The next prime is 505550153. The reversal of 505550121 is 121055505.

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 505550121 - 2⁹ = 505549609 is a prime.

It is a super-2 number, since 2×505550121² = 511161849686229282, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 505550091 and 505550100.

It is not an unprimeable number, because it can be changed into a prime (505550161) 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, 84258351 + ... + 84258356.

It is an arithmetic number, because the mean of its divisors is an integer number (168516708).

Almost surely, 2^505550121 is an apocalyptic number.

It is an amenable number.

505550121 is a deficient number, since it is larger than the sum of its proper divisors (168516711).

505550121 is a wasteful number, since it uses less digits than its factorization.

505550121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168516710.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 505550121 is about 22484.4417542442. The cubic root of 505550121 is about 796.6264822394.

The spelling of 505550121 in words is "five hundred five million, five hundred fifty thousand, one hundred twenty-one".