11123231011 has 2 divisors, whose sum is σ = 11123231012. Its totient is φ = 11123231010.

The previous prime is 11123230961. The next prime is 11123231023. The reversal of 11123231011 is 11013232111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11123231011 is a prime.

It is not a weakly prime, because it can be changed into another prime (11123231071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561615505 + 5561615506.

It is an arithmetic number, because the mean of its divisors is an integer number (5561615506).

Almost surely, 2^11123231011 is an apocalyptic number.

11123231011 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123231011 is an equidigital number, since it uses as much as digits as its factorization.

11123231011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11123231011 its reverse (11013232111), we get a palindrome (22136463122).

The spelling of 11123231011 in words is "eleven billion, one hundred twenty-three million, two hundred thirty-one thousand, eleven".