5511311231 has 2 divisors, whose sum is σ = 5511311232. Its totient is φ = 5511311230.

The previous prime is 5511311191. The next prime is 5511311249. The reversal of 5511311231 is 1321131155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5511311231 - 2¹⁴ = 5511294847 is a prime.

It is a super-2 number, since 2×5511311231² = 60749102969893470722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 5511311197 and 5511311206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5511311291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2755655615 + 2755655616.

It is an arithmetic number, because the mean of its divisors is an integer number (2755655616).

Almost surely, 2^5511311231 is an apocalyptic number.

5511311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

5511311231 is an equidigital number, since it uses as much as digits as its factorization.

5511311231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 5511311231 is about 74238.2060060721. The cubic root of 5511311231 is about 1766.3834174150.

Adding to 5511311231 its reverse (1321131155), we get a palindrome (6832442386).

The spelling of 5511311231 in words is "five billion, five hundred eleven million, three hundred eleven thousand, two hundred thirty-one".