5551115111 has 4 divisors (see below), whose sum is σ = 5877651312. Its totient is φ = 5224578912.

The previous prime is 5551115083. The next prime is 5551115197. The reversal of 5551115111 is 1115111555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1115111555 = 5 ⋅223022311.

It is a cyclic number.

It is not a de Polignac number, because 5551115111 - 2¹⁰ = 5551114087 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 (5551115611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163268075 + ... + 163268108.

It is an arithmetic number, because the mean of its divisors is an integer number (1469412828).

Almost surely, 2^5551115111 is an apocalyptic number.

5551115111 is a deficient number, since it is larger than the sum of its proper divisors (326536201).

5551115111 is a wasteful number, since it uses less digits than its factorization.

5551115111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326536200.

The product of its digits is 625, while the sum is 26.

The square root of 5551115111 is about 74505.8058878635. The cubic root of 5551115111 is about 1770.6256218846.

Adding to 5551115111 its reverse (1115111555), we get a palindrome (6666226666).

The spelling of 5551115111 in words is "five billion, five hundred fifty-one million, one hundred fifteen thousand, one hundred eleven".