981218775 has 12 divisors (see below), whose sum is σ = 1622281832. Its totient is φ = 523316640.

The previous prime is 981218773. The next prime is 981218813. The reversal of 981218775 is 577812189.

It is a happy number.

It is not a de Polignac number, because 981218775 - 2¹ = 981218773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981218773) 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 11 ways as a sum of consecutive naturals, for example, 6541384 + ... + 6541533.

Almost surely, 2^981218775 is an apocalyptic number.

981218775 is a deficient number, since it is larger than the sum of its proper divisors (641063057).

981218775 is a wasteful number, since it uses less digits than its factorization.

981218775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13082930 (or 13082925 counting only the distinct ones).

The product of its digits is 282240, while the sum is 48.

The square root of 981218775 is about 31324.4118061297. The cubic root of 981218775 is about 993.6999848251.

The spelling of 981218775 in words is "nine hundred eighty-one million, two hundred eighteen thousand, seven hundred seventy-five".