918481121 has 2 divisors, whose sum is σ = 918481122. Its totient is φ = 918481120.

The previous prime is 918481093. The next prime is 918481141. The reversal of 918481121 is 121184819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 909866896 + 8614225 = 30164^2 + 2935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918481121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (918481141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459240560 + 459240561.

It is an arithmetic number, because the mean of its divisors is an integer number (459240561).

Almost surely, 2^918481121 is an apocalyptic number.

It is an amenable number.

918481121 is a deficient number, since it is larger than the sum of its proper divisors (1).

918481121 is an equidigital number, since it uses as much as digits as its factorization.

918481121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 35.

The square root of 918481121 is about 30306.4534546687. The cubic root of 918481121 is about 972.0532977966.

The spelling of 918481121 in words is "nine hundred eighteen million, four hundred eighty-one thousand, one hundred twenty-one".