22311881 has 2 divisors, whose sum is σ = 22311882. Its totient is φ = 22311880.

The previous prime is 22311857. The next prime is 22311907. The reversal of 22311881 is 18811322.

It is an a-pointer prime, because the next prime (22311907) can be obtained adding 22311881 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22231225 + 80656 = 4715^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 22311881 - 2¹⁸ = 22049737 is a prime.

It is a super-3 number, since 3×22311881³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22311881.

It is not a weakly prime, because it can be changed into another prime (22310881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11155940 + 11155941.

It is an arithmetic number, because the mean of its divisors is an integer number (11155941).

Almost surely, 2^22311881 is an apocalyptic number.

It is an amenable number.

22311881 is a deficient number, since it is larger than the sum of its proper divisors (1).

22311881 is an equidigital number, since it uses as much as digits as its factorization.

22311881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 26.

The square root of 22311881 is about 4723.5453845602. The cubic root of 22311881 is about 281.5218201061.

The spelling of 22311881 in words is "twenty-two million, three hundred eleven thousand, eight hundred eighty-one".