90441521 has 2 divisors, whose sum is σ = 90441522. Its totient is φ = 90441520.

The previous prime is 90441511. The next prime is 90441523. The reversal of 90441521 is 12514409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 874225 = 9464^2 + 935^2 .

It is an emirp because it is prime and its reverse (12514409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90441521 - 2⁶ = 90441457 is a prime.

Together with 90441523, 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 (90441523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45220760 + 45220761.

It is an arithmetic number, because the mean of its divisors is an integer number (45220761).

Almost surely, 2^90441521 is an apocalyptic number.

It is an amenable number.

90441521 is a deficient number, since it is larger than the sum of its proper divisors (1).

90441521 is an equidigital number, since it uses as much as digits as its factorization.

90441521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 90441521 is about 9510.0747105372. The cubic root of 90441521 is about 448.8721070659.

The spelling of 90441521 in words is "ninety million, four hundred forty-one thousand, five hundred twenty-one".