1018992889 has 2 divisors, whose sum is σ = 1018992890. Its totient is φ = 1018992888.

The previous prime is 1018992881. The next prime is 1018992899. The reversal of 1018992889 is 9882998101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 634636864 + 384356025 = 25192^2 + 19605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018992889 - 2³ = 1018992881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1018992881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509496444 + 509496445.

It is an arithmetic number, because the mean of its divisors is an integer number (509496445).

Almost surely, 2^1018992889 is an apocalyptic number.

It is an amenable number.

1018992889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018992889 is an equidigital number, since it uses as much as digits as its factorization.

1018992889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 55.

The square root of 1018992889 is about 31921.6680171948. The cubic root of 1018992889 is about 1006.2912995459.

The spelling of 1018992889 in words is "one billion, eighteen million, nine hundred ninety-two thousand, eight hundred eighty-nine".