918899987 has 2 divisors, whose sum is σ = 918899988. Its totient is φ = 918899986.

The previous prime is 918899957. The next prime is 918900001. The reversal of 918899987 is 789998819.

It is a happy number.

918899987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (789998819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918899987 - 2²² = 914705683 is a prime.

It is a super-2 number, since 2×918899987² = 1688754372217200338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (918899957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459449993 + 459449994.

It is an arithmetic number, because the mean of its divisors is an integer number (459449994).

Almost surely, 2^918899987 is an apocalyptic number.

918899987 is a deficient number, since it is larger than the sum of its proper divisors (1).

918899987 is an equidigital number, since it uses as much as digits as its factorization.

918899987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 68.

The square root of 918899987 is about 30313.3631753390. The cubic root of 918899987 is about 972.2010410614.

The spelling of 918899987 in words is "nine hundred eighteen million, eight hundred ninety-nine thousand, nine hundred eighty-seven".