818954947 has 4 divisors (see below), whose sum is σ = 819172440. Its totient is φ = 818737456.

The previous prime is 818954921. The next prime is 818954963. The reversal of 818954947 is 749459818.

It is a happy number.

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 818954947 - 2⁷ = 818954819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818954047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102997 + ... + 110662.

It is an arithmetic number, because the mean of its divisors is an integer number (204793110).

Almost surely, 2^818954947 is an apocalyptic number.

818954947 is a deficient number, since it is larger than the sum of its proper divisors (217493).

818954947 is a wasteful number, since it uses less digits than its factorization.

818954947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217492.

The product of its digits is 2903040, while the sum is 55.

The square root of 818954947 is about 28617.3888920705. The cubic root of 818954947 is about 935.5923675330.

It can be divided in two parts, 8189 and 54947, that added together give a palindrome (63136).

The spelling of 818954947 in words is "eight hundred eighteen million, nine hundred fifty-four thousand, nine hundred forty-seven".