918227381 has 2 divisors, whose sum is σ = 918227382. Its totient is φ = 918227380.

The previous prime is 918227371. The next prime is 918227389. The reversal of 918227381 is 183722819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854626756 + 63600625 = 29234^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 918227381 - 2²⁶ = 851118517 is a prime.

It is a super-2 number, since 2×918227381² = 1686283046436238322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918227389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459113690 + 459113691.

It is an arithmetic number, because the mean of its divisors is an integer number (459113691).

Almost surely, 2^918227381 is an apocalyptic number.

It is an amenable number.

918227381 is a deficient number, since it is larger than the sum of its proper divisors (1).

918227381 is an equidigital number, since it uses as much as digits as its factorization.

918227381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 918227381 is about 30302.2669283999. The cubic root of 918227381 is about 971.9637762613.

It can be divided in two parts, 9182 and 27381, that added together give a palindrome (36563).

The spelling of 918227381 in words is "nine hundred eighteen million, two hundred twenty-seven thousand, three hundred eighty-one".