89855621 has 2 divisors, whose sum is σ = 89855622. Its totient is φ = 89855620.

The previous prime is 89855611. The next prime is 89855657. The reversal of 89855621 is 12655898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 16564900 = 8561^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 89855621 - 2¹⁸ = 89593477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89855611) 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, 44927810 + 44927811.

It is an arithmetic number, because the mean of its divisors is an integer number (44927811).

Almost surely, 2^89855621 is an apocalyptic number.

It is an amenable number.

89855621 is a deficient number, since it is larger than the sum of its proper divisors (1).

89855621 is an equidigital number, since it uses as much as digits as its factorization.

89855621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 89855621 is about 9479.2204848289. The cubic root of 89855621 is about 447.9007090889.

The spelling of 89855621 in words is "eighty-nine million, eight hundred fifty-five thousand, six hundred twenty-one".