89993921 has 2 divisors, whose sum is σ = 89993922. Its totient is φ = 89993920.

The previous prime is 89993909. The next prime is 89993941. The reversal of 89993921 is 12939998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 15689521 = 8620^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 89993921 - 2¹⁸ = 89731777 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 89993921.

It is not a weakly prime, because it can be changed into another prime (89993941) 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, 44996960 + 44996961.

It is an arithmetic number, because the mean of its divisors is an integer number (44996961).

Almost surely, 2^89993921 is an apocalyptic number.

It is an amenable number.

89993921 is a deficient number, since it is larger than the sum of its proper divisors (1).

89993921 is an equidigital number, since it uses as much as digits as its factorization.

89993921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 50.

The square root of 89993921 is about 9486.5125836632. The cubic root of 89993921 is about 448.1303846287.

The spelling of 89993921 in words is "eighty-nine million, nine hundred ninety-three thousand, nine hundred twenty-one".