918481947 has 4 divisors (see below), whose sum is σ = 1224642600. Its totient is φ = 612321296.

The previous prime is 918481937. The next prime is 918481951. The reversal of 918481947 is 749184819.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 918481947 - 2¹⁰ = 918480923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 918481947.

It is not an unprimeable number, because it can be changed into a prime (918481937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153080322 + ... + 153080327.

It is an arithmetic number, because the mean of its divisors is an integer number (306160650).

Almost surely, 2^918481947 is an apocalyptic number.

918481947 is a deficient number, since it is larger than the sum of its proper divisors (306160653).

918481947 is a wasteful number, since it uses less digits than its factorization.

918481947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306160652.

The product of its digits is 580608, while the sum is 51.

The square root of 918481947 is about 30306.4670821262. The cubic root of 918481947 is about 972.0535891892.

The spelling of 918481947 in words is "nine hundred eighteen million, four hundred eighty-one thousand, nine hundred forty-seven".