89129832978521 has 2 divisors, whose sum is σ = 89129832978522. Its totient is φ = 89129832978520.

The previous prime is 89129832978503. The next prime is 89129832978559. The reversal of 89129832978521 is 12587923892198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80674886886400 + 8454946092121 = 8981920^2 + 2907739^2 .

It is a cyclic number.

It is not a de Polignac number, because 89129832978521 - 2¹⁸ = 89129832716377 is a prime.

It is not a weakly prime, because it can be changed into another prime (89129832978721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44564916489260 + 44564916489261.

It is an arithmetic number, because the mean of its divisors is an integer number (44564916489261).

Almost surely, 2^{89129832978521} is an apocalyptic number.

It is an amenable number.

89129832978521 is a deficient number, since it is larger than the sum of its proper divisors (1).

89129832978521 is an equidigital number, since it uses as much as digits as its factorization.

89129832978521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 313528320, while the sum is 74.

The spelling of 89129832978521 in words is "eighty-nine trillion, one hundred twenty-nine billion, eight hundred thirty-two million, nine hundred seventy-eight thousand, five hundred twenty-one".