89921989 has 2 divisors, whose sum is σ = 89921990. Its totient is φ = 89921988.

The previous prime is 89921983. The next prime is 89922031. The reversal of 89921989 is 98912998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 35605089 = 7370^2 + 5967^2 .

It is a cyclic number.

It is not a de Polignac number, because 89921989 - 2⁵ = 89921957 is a prime.

It is a super-2 number, since 2×89921989² = 16171928211432242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89921983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44960994 + 44960995.

It is an arithmetic number, because the mean of its divisors is an integer number (44960995).

Almost surely, 2^89921989 is an apocalyptic number.

It is an amenable number.

89921989 is a deficient number, since it is larger than the sum of its proper divisors (1).

89921989 is an equidigital number, since it uses as much as digits as its factorization.

89921989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 55.

The square root of 89921989 is about 9482.7205484502. The cubic root of 89921989 is about 448.0109561654.

The spelling of 89921989 in words is "eighty-nine million, nine hundred twenty-one thousand, nine hundred eighty-nine".