981078218 has 4 divisors (see below), whose sum is σ = 1471617330. Its totient is φ = 490539108.

The previous prime is 981078209. The next prime is 981078223. The reversal of 981078218 is 812870189.

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

It can be written as a sum of positive squares in only one way, i.e., 770451049 + 210627169 = 27757^2 + 14513^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245269553 + ... + 245269556.

Almost surely, 2^981078218 is an apocalyptic number.

981078218 is a deficient number, since it is larger than the sum of its proper divisors (490539112).

981078218 is a wasteful number, since it uses less digits than its factorization.

981078218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490539111.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 981078218 is about 31322.1681561159. The cubic root of 981078218 is about 993.6525342591.

The spelling of 981078218 in words is "nine hundred eighty-one million, seventy-eight thousand, two hundred eighteen".