11213231 has 2 divisors, whose sum is σ = 11213232. Its totient is φ = 11213230.

The previous prime is 11213221. The next prime is 11213233. The reversal of 11213231 is 13231211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11213231 is a prime.

It is a super-2 number, since 2×11213231² = 251473098918722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 11213233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606615 + 5606616.

It is an arithmetic number, because the mean of its divisors is an integer number (5606616).

Almost surely, 2^11213231 is an apocalyptic number.

11213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213231 is an equidigital number, since it uses as much as digits as its factorization.

11213231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 11213231 is about 3348.6162813915. The cubic root of 11213231 is about 223.8258571587.

Adding to 11213231 its reverse (13231211), we get a palindrome (24444442).

The spelling of 11213231 in words is "eleven million, two hundred thirteen thousand, two hundred thirty-one".