89373721817 has 2 divisors, whose sum is σ = 89373721818. Its totient is φ = 89373721816.

The previous prime is 89373721813. The next prime is 89373721837. The reversal of 89373721817 is 71812737398.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58295205136 + 31078516681 = 241444^2 + 176291^2 .

It is a cyclic number.

It is not a de Polignac number, because 89373721817 - 2² = 89373721813 is a prime.

It is not a weakly prime, because it can be changed into another prime (89373721813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44686860908 + 44686860909.

It is an arithmetic number, because the mean of its divisors is an integer number (44686860909).

Almost surely, 2^89373721817 is an apocalyptic number.

It is an amenable number.

89373721817 is a deficient number, since it is larger than the sum of its proper divisors (1).

89373721817 is an equidigital number, since it uses as much as digits as its factorization.

89373721817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 56.

The spelling of 89373721817 in words is "eighty-nine billion, three hundred seventy-three million, seven hundred twenty-one thousand, eight hundred seventeen".