550551111 has 16 divisors (see below), whose sum is σ = 812083968. Its totient is φ = 328966400.

The previous prime is 550551107. The next prime is 550551149. The reversal of 550551111 is 111155055.

It is a cyclic number.

It is not a de Polignac number, because 550551111 - 2² = 550551107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550551151) 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, 115146 + ... + 119831.

It is an arithmetic number, because the mean of its divisors is an integer number (50755248).

Almost surely, 2^550551111 is an apocalyptic number.

550551111 is a deficient number, since it is larger than the sum of its proper divisors (261532857).

550551111 is a wasteful number, since it uses less digits than its factorization.

550551111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235062.

The product of its (nonzero) digits is 625, while the sum is 24.

The square root of 550551111 is about 23463.8255832249. The cubic root of 550551111 is about 819.5948380142.

It can be divided in two parts, 5505 and 51111, that added together give a triangular number (56616 = T₃₃₆).

The spelling of 550551111 in words is "five hundred fifty million, five hundred fifty-one thousand, one hundred eleven".