89089981 has 2 divisors, whose sum is σ = 89089982. Its totient is φ = 89089980.

The previous prime is 89089961. The next prime is 89090011. The reversal of 89089981 is 18998098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89019225 + 70756 = 9435^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 89089981 - 2⁷ = 89089853 is a prime.

It is a super-2 number, since 2×89089981² = 15874049429160722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89089961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44544990 + 44544991.

It is an arithmetic number, because the mean of its divisors is an integer number (44544991).

Almost surely, 2^89089981 is an apocalyptic number.

It is an amenable number.

89089981 is a deficient number, since it is larger than the sum of its proper divisors (1).

89089981 is an equidigital number, since it uses as much as digits as its factorization.

89089981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 52.

The square root of 89089981 is about 9438.7489107402. The cubic root of 89089981 is about 446.6249241331.

The spelling of 89089981 in words is "eighty-nine million, eighty-nine thousand, nine hundred eighty-one".