89087981 has 2 divisors, whose sum is σ = 89087982. Its totient is φ = 89087980.

The previous prime is 89087969. The next prime is 89088047. The reversal of 89087981 is 18978098.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82065481 + 7022500 = 9059^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 89087981 - 2⁶ = 89087917 is a prime.

It is a super-2 number, since 2×89087981² = 15873336717312722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89087081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44543990 + 44543991.

It is an arithmetic number, because the mean of its divisors is an integer number (44543991).

Almost surely, 2^89087981 is an apocalyptic number.

It is an amenable number.

89087981 is a deficient number, since it is larger than the sum of its proper divisors (1).

89087981 is an equidigital number, since it uses as much as digits as its factorization.

89087981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 89087981 is about 9438.6429639011. The cubic root of 89087981 is about 446.6215819820.

The spelling of 89087981 in words is "eighty-nine million, eighty-seven thousand, nine hundred eighty-one".