91485521 has 2 divisors, whose sum is σ = 91485522. Its totient is φ = 91485520.

The previous prime is 91485487. The next prime is 91485587. The reversal of 91485521 is 12558419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 1918225 = 9464^2 + 1385^2 .

It is an emirp because it is prime and its reverse (12558419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91485521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91415521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45742760 + 45742761.

It is an arithmetic number, because the mean of its divisors is an integer number (45742761).

Almost surely, 2^91485521 is an apocalyptic number.

It is an amenable number.

91485521 is a deficient number, since it is larger than the sum of its proper divisors (1).

91485521 is an equidigital number, since it uses as much as digits as its factorization.

91485521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 35.

The square root of 91485521 is about 9564.8063754579. The cubic root of 91485521 is about 450.5926692922.

The spelling of 91485521 in words is "ninety-one million, four hundred eighty-five thousand, five hundred twenty-one".