918866331 has 12 divisors (see below), whose sum is σ = 1332807840. Its totient is φ = 610013040.

The previous prime is 918866329. The next prime is 918866359. The reversal of 918866331 is 133668819.

It is a happy number.

918866331 is a `hidden beast` number, since 9 + 1 + 8 + 8 + 6 + 633 + 1 = 666.

It is not a de Polignac number, because 918866331 - 2¹ = 918866329 is a prime.

It is a super-2 number, since 2×918866331² = 1688630668490803122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (918866321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211440 + ... + 215741.

It is an arithmetic number, because the mean of its divisors is an integer number (111067320).

Almost surely, 2^918866331 is an apocalyptic number.

918866331 is a deficient number, since it is larger than the sum of its proper divisors (413941509).

918866331 is a wasteful number, since it uses less digits than its factorization.

918866331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427426 (or 427423 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 918866331 is about 30312.8080355483. The cubic root of 918866331 is about 972.1891715079.

The spelling of 918866331 in words is "nine hundred eighteen million, eight hundred sixty-six thousand, three hundred thirty-one".