918659881 has 2 divisors, whose sum is σ = 918659882. Its totient is φ = 918659880.

The previous prime is 918659851. The next prime is 918659891. The reversal of 918659881 is 188956819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917181225 + 1478656 = 30285^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 918659881 - 2¹¹ = 918657833 is a prime.

It is a super-2 number, since 2×918659881² = 1687871953917868322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (918659831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459329940 + 459329941.

It is an arithmetic number, because the mean of its divisors is an integer number (459329941).

Almost surely, 2^918659881 is an apocalyptic number.

It is an amenable number.

918659881 is a deficient number, since it is larger than the sum of its proper divisors (1).

918659881 is an equidigital number, since it uses as much as digits as its factorization.

918659881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 55.

The square root of 918659881 is about 30309.4025180306. The cubic root of 918659881 is about 972.1163558794.

The spelling of 918659881 in words is "nine hundred eighteen million, six hundred fifty-nine thousand, eight hundred eighty-one".