1989806011 has 2 divisors, whose sum is σ = 1989806012. Its totient is φ = 1989806010.

The previous prime is 1989805981. The next prime is 1989806033. The reversal of 1989806011 is 1106089891.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1106089891) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1109086861 and 1686809011.

It is a cyclic number.

It is not a de Polignac number, because 1989806011 - 2²⁷ = 1855588283 is a prime.

It is a super-2 number, since 2×1989806011² = 7918655922823464242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1989806081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994903005 + 994903006.

It is an arithmetic number, because the mean of its divisors is an integer number (994903006).

Almost surely, 2^1989806011 is an apocalyptic number.

1989806011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989806011 is an equidigital number, since it uses as much as digits as its factorization.

1989806011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 1989806011 is about 44607.2416878695. The cubic root of 1989806011 is about 1257.7767991259.

The spelling of 1989806011 in words is "one billion, nine hundred eighty-nine million, eight hundred six thousand, eleven".