89635921 has 2 divisors, whose sum is σ = 89635922. Its totient is φ = 89635920.

The previous prime is 89635919. The next prime is 89635937. The reversal of 89635921 is 12953698.

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., 55577025 + 34058896 = 7455^2 + 5836^2 .

It is a cyclic number.

It is not a de Polignac number, because 89635921 - 2¹ = 89635919 is a prime.

Together with 89635919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (89635981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44817960 + 44817961.

It is an arithmetic number, because the mean of its divisors is an integer number (44817961).

Almost surely, 2^89635921 is an apocalyptic number.

It is an amenable number.

89635921 is a deficient number, since it is larger than the sum of its proper divisors (1).

89635921 is an equidigital number, since it uses as much as digits as its factorization.

89635921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 89635921 is about 9467.6248869503. The cubic root of 89635921 is about 447.5353670954.

It can be divided in two parts, 8963 and 5921, that added together give a square (14884 = 122²).

The spelling of 89635921 in words is "eighty-nine million, six hundred thirty-five thousand, nine hundred twenty-one".