11311210381 has 2 divisors, whose sum is σ = 11311210382. Its totient is φ = 11311210380.

The previous prime is 11311210367. The next prime is 11311210399. The reversal of 11311210381 is 18301211311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7079707881 + 4231502500 = 84141^2 + 65050^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311210381 - 2¹¹ = 11311208333 is a prime.

It is a super-2 number, since 2×11311210381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11311210081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655605190 + 5655605191.

It is an arithmetic number, because the mean of its divisors is an integer number (5655605191).

Almost surely, 2^11311210381 is an apocalyptic number.

It is an amenable number.

11311210381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311210381 is an equidigital number, since it uses as much as digits as its factorization.

11311210381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 11311210381 its reverse (18301211311), we get a palindrome (29612421692).

The spelling of 11311210381 in words is "eleven billion, three hundred eleven million, two hundred ten thousand, three hundred eighty-one".