5515123211 has 4 divisors (see below), whose sum is σ = 5939363472. Its totient is φ = 5090882952.

The previous prime is 5515123193. The next prime is 5515123223. The reversal of 5515123211 is 1123215155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5515123211 - 2⁶ = 5515123147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5515122211) 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, 212120111 + ... + 212120136.

It is an arithmetic number, because the mean of its divisors is an integer number (1484840868).

Almost surely, 2^5515123211 is an apocalyptic number.

5515123211 is a deficient number, since it is larger than the sum of its proper divisors (424240261).

5515123211 is a wasteful number, since it uses less digits than its factorization.

5515123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424240260.

The product of its digits is 1500, while the sum is 26.

The square root of 5515123211 is about 74263.8755452474. The cubic root of 5515123211 is about 1766.7905719711.

Adding to 5515123211 its reverse (1123215155), we get a palindrome (6638338366).

The spelling of 5515123211 in words is "five billion, five hundred fifteen million, one hundred twenty-three thousand, two hundred eleven".