551555111 has 8 divisors (see below), whose sum is σ = 575803104. Its totient is φ = 527329440.

The previous prime is 551555071. The next prime is 551555113. The reversal of 551555111 is 111555155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551555111 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 (551555113) 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, 62981 + ... + 71201.

It is an arithmetic number, because the mean of its divisors is an integer number (71975388).

Almost surely, 2^551555111 is an apocalyptic number.

551555111 is a deficient number, since it is larger than the sum of its proper divisors (24247993).

551555111 is a wasteful number, since it uses less digits than its factorization.

551555111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11161.

The product of its digits is 3125, while the sum is 29.

The square root of 551555111 is about 23485.2104738280. The cubic root of 551555111 is about 820.0927472924.

The spelling of 551555111 in words is "five hundred fifty-one million, five hundred fifty-five thousand, one hundred eleven".