1018831978 has 4 divisors (see below), whose sum is σ = 1528247970. Its totient is φ = 509415988.

The previous prime is 1018831937. The next prime is 1018831987. The reversal of 1018831978 is 8791388101.

1018831978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8791388101 = 59671 ⋅147331.

It can be written as a sum of positive squares in only one way, i.e., 972005329 + 46826649 = 31177^2 + 6843^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254707993 + ... + 254707996.

Almost surely, 2^1018831978 is an apocalyptic number.

1018831978 is a deficient number, since it is larger than the sum of its proper divisors (509415992).

1018831978 is an equidigital number, since it uses as much as digits as its factorization.

1018831978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509415991.

The product of its (nonzero) digits is 96768, while the sum is 46.

The square root of 1018831978 is about 31919.1475136790. The cubic root of 1018831978 is about 1006.2383283345.

The spelling of 1018831978 in words is "one billion, eighteen million, eight hundred thirty-one thousand, nine hundred seventy-eight".