89563841821 has 2 divisors, whose sum is σ = 89563841822. Its totient is φ = 89563841820.

The previous prime is 89563841767. The next prime is 89563841837. The reversal of 89563841821 is 12814836598.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46584747225 + 42979094596 = 215835^2 + 207314^2 .

It is a cyclic number.

It is not a de Polignac number, because 89563841821 - 2¹¹ = 89563839773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89563841881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44781920910 + 44781920911.

It is an arithmetic number, because the mean of its divisors is an integer number (44781920911).

Almost surely, 2^89563841821 is an apocalyptic number.

It is an amenable number.

89563841821 is a deficient number, since it is larger than the sum of its proper divisors (1).

89563841821 is an equidigital number, since it uses as much as digits as its factorization.

89563841821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 55.

The spelling of 89563841821 in words is "eighty-nine billion, five hundred sixty-three million, eight hundred forty-one thousand, eight hundred twenty-one".