505550111 has 16 divisors (see below), whose sum is σ = 556633728. Its totient is φ = 455344800.

The previous prime is 505550099. The next prime is 505550153. The reversal of 505550111 is 111055505.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 505550111 - 2¹⁴ = 505533727 is a prime.

It is a super-2 number, since 2×505550111² = 511161829464224642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 731276 + ... + 731966.

It is an arithmetic number, because the mean of its divisors is an integer number (34789608).

Almost surely, 2^505550111 is an apocalyptic number.

505550111 is a deficient number, since it is larger than the sum of its proper divisors (51083617).

505550111 is a wasteful number, since it uses less digits than its factorization.

505550111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 505550111 is about 22484.4415318682. The cubic root of 505550111 is about 796.6264769869.

The spelling of 505550111 in words is "five hundred five million, five hundred fifty thousand, one hundred eleven".