11218631 has 2 divisors, whose sum is σ = 11218632. Its totient is φ = 11218630.

The previous prime is 11218619. The next prime is 11218633. The reversal of 11218631 is 13681211.

It is a strong prime.

It is an emirp because it is prime and its reverse (13681211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11218631 is a prime.

It is a super-2 number, since 2×11218631² = 251715363028322, which contains 22 as substring.

Together with 11218633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11218597 and 11218606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11218633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5609315 + 5609316.

It is an arithmetic number, because the mean of its divisors is an integer number (5609316).

Almost surely, 2^11218631 is an apocalyptic number.

11218631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11218631 is an equidigital number, since it uses as much as digits as its factorization.

11218631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

The square root of 11218631 is about 3349.4224875342. The cubic root of 11218631 is about 223.8617809605.

Adding to 11218631 its reverse (13681211), we get a palindrome (24899842).

The spelling of 11218631 in words is "eleven million, two hundred eighteen thousand, six hundred thirty-one".