89821799 has 2 divisors, whose sum is σ = 89821800. Its totient is φ = 89821798.

The previous prime is 89821783. The next prime is 89821807. The reversal of 89821799 is 99712898.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89821799 - 2⁴ = 89821783 is a prime.

It is a Sophie Germain 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 89821799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89821769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44910899 + 44910900.

It is an arithmetic number, because the mean of its divisors is an integer number (44910900).

Almost surely, 2^89821799 is an apocalyptic number.

89821799 is a deficient number, since it is larger than the sum of its proper divisors (1).

89821799 is an equidigital number, since it uses as much as digits as its factorization.

89821799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The square root of 89821799 is about 9477.4363094668. The cubic root of 89821799 is about 447.8445048555.

The spelling of 89821799 in words is "eighty-nine million, eight hundred twenty-one thousand, seven hundred ninety-nine".