89915521 has 2 divisors, whose sum is σ = 89915522. Its totient is φ = 89915520.

The previous prime is 89915519. The next prime is 89915549. The reversal of 89915521 is 12551998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 9991921 = 8940^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 89915521 - 2¹ = 89915519 is a prime.

Together with 89915519, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89915591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44957760 + 44957761.

It is an arithmetic number, because the mean of its divisors is an integer number (44957761).

Almost surely, 2^89915521 is an apocalyptic number.

It is an amenable number.

89915521 is a deficient number, since it is larger than the sum of its proper divisors (1).

89915521 is an equidigital number, since it uses as much as digits as its factorization.

89915521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 40.

The square root of 89915521 is about 9482.3795009481. The cubic root of 89915521 is about 448.0002142458. Note that the first 3 decimals are identical.

The spelling of 89915521 in words is "eighty-nine million, nine hundred fifteen thousand, five hundred twenty-one".