918817331 has 2 divisors, whose sum is σ = 918817332. Its totient is φ = 918817330.

The previous prime is 918817307. The next prime is 918817369. The reversal of 918817331 is 133718819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 918817331 - 2⁶ = 918817267 is a prime.

It is a super-2 number, since 2×918817331² = 1688450575491927122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (918817631) 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, 459408665 + 459408666.

It is an arithmetic number, because the mean of its divisors is an integer number (459408666).

Almost surely, 2^918817331 is an apocalyptic number.

918817331 is a deficient number, since it is larger than the sum of its proper divisors (1).

918817331 is an equidigital number, since it uses as much as digits as its factorization.

918817331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 918817331 is about 30311.9997855635. Note that the first 3 decimals coincide. The cubic root of 918817331 is about 972.1718900257.

The spelling of 918817331 in words is "nine hundred eighteen million, eight hundred seventeen thousand, three hundred thirty-one".