11311031 has 2 divisors, whose sum is σ = 11311032. Its totient is φ = 11311030.

The previous prime is 11311019. The next prime is 11311033. The reversal of 11311031 is 13011311.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13011311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11311031 is a prime.

It is a super-2 number, since 2×11311031² = 255878844565922, which contains 22 as substring.

Together with 11311033, 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 (11311033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655515 + 5655516.

It is an arithmetic number, because the mean of its divisors is an integer number (5655516).

Almost surely, 2^11311031 is an apocalyptic number.

11311031 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311031 is an equidigital number, since it uses as much as digits as its factorization.

11311031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 11311031 is about 3363.1876248583. The cubic root of 11311031 is about 224.4746988284.

Adding to 11311031 its reverse (13011311), we get a palindrome (24322342).

The spelling of 11311031 in words is "eleven million, three hundred eleven thousand, thirty-one".