551231111 has 16 divisors (see below), whose sum is σ = 572780160. Its totient is φ = 530200320.

The previous prime is 551231099. The next prime is 551231113. The reversal of 551231111 is 111132155.

It is a happy number.

551231111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 551231111 - 2⁶ = 551231047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551231113) 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, 723971 + ... + 724731.

It is an arithmetic number, because the mean of its divisors is an integer number (35798760).

Almost surely, 2^551231111 is an apocalyptic number.

551231111 is a deficient number, since it is larger than the sum of its proper divisors (21549049).

551231111 is a wasteful number, since it uses less digits than its factorization.

551231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 150, while the sum is 20.

The square root of 551231111 is about 23478.3115023206. The cubic root of 551231111 is about 819.9321334870.

Adding to 551231111 its reverse (111132155), we get a palindrome (662363266).

The spelling of 551231111 in words is "five hundred fifty-one million, two hundred thirty-one thousand, one hundred eleven".