505778121 has 8 divisors (see below), whose sum is σ = 749300960. Its totient is φ = 337185396.

The previous prime is 505778111. The next prime is 505778137. The reversal of 505778121 is 121877505.

505778121 is a `hidden beast` number, since 5 + 0 + 577 + 81 + 2 + 1 = 666.

It is not a de Polignac number, because 505778121 - 2⁵ = 505778089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505778111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9366235 + ... + 9366288.

It is an arithmetic number, because the mean of its divisors is an integer number (93662620).

Almost surely, 2^505778121 is an apocalyptic number.

It is an amenable number.

505778121 is a deficient number, since it is larger than the sum of its proper divisors (243522839).

505778121 is a wasteful number, since it uses less digits than its factorization.

505778121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18732532 (or 18732526 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 505778121 is about 22489.5113552963. The cubic root of 505778121 is about 796.7462221244.

The spelling of 505778121 in words is "five hundred five million, seven hundred seventy-eight thousand, one hundred twenty-one".