981110989 has 2 divisors, whose sum is σ = 981110990. Its totient is φ = 981110988.

The previous prime is 981110983. The next prime is 981111011. The reversal of 981110989 is 989011189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 943534089 + 37576900 = 30717^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 981110989 - 2⁵ = 981110957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981110983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490555494 + 490555495.

It is an arithmetic number, because the mean of its divisors is an integer number (490555495).

Almost surely, 2^981110989 is an apocalyptic number.

It is an amenable number.

981110989 is a deficient number, since it is larger than the sum of its proper divisors (1).

981110989 is an equidigital number, since it uses as much as digits as its factorization.

981110989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 981110989 is about 31322.6912796458. The cubic root of 981110989 is about 993.6635978094.

The spelling of 981110989 in words is "nine hundred eighty-one million, one hundred ten thousand, nine hundred eighty-nine".