5511231111 has 16 divisors (see below), whose sum is σ = 7650947808. Its totient is φ = 3525772800.

The previous prime is 5511231107. The next prime is 5511231113. The reversal of 5511231111 is 1111321155.

It is not a de Polignac number, because 5511231111 - 2² = 5511231107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511231113) 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, 359766 + ... + 374771.

It is an arithmetic number, because the mean of its divisors is an integer number (478184238).

Almost surely, 2^5511231111 is an apocalyptic number.

5511231111 is a deficient number, since it is larger than the sum of its proper divisors (2139716697).

5511231111 is a wasteful number, since it uses less digits than its factorization.

5511231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734642.

The product of its digits is 150, while the sum is 21.

The square root of 5511231111 is about 74237.6663897782. Note that the first 3 decimals coincide. The cubic root of 5511231111 is about 1766.3748578473.

Adding to 5511231111 its reverse (1111321155), we get a palindrome (6622552266).

The spelling of 5511231111 in words is "five billion, five hundred eleven million, two hundred thirty-one thousand, one hundred eleven".