91853521 has 2 divisors, whose sum is σ = 91853522. Its totient is φ = 91853520.

The previous prime is 91853497. The next prime is 91853569. The reversal of 91853521 is 12535819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91107025 + 746496 = 9545^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 91853521 - 2⁷ = 91853393 is a prime.

It is not a weakly prime, because it can be changed into another prime (91853591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45926760 + 45926761.

It is an arithmetic number, because the mean of its divisors is an integer number (45926761).

Almost surely, 2^91853521 is an apocalyptic number.

It is an amenable number.

91853521 is a deficient number, since it is larger than the sum of its proper divisors (1).

91853521 is an equidigital number, since it uses as much as digits as its factorization.

91853521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 91853521 is about 9584.0242591513. The cubic root of 91853521 is about 451.1960298455.

The spelling of 91853521 in words is "ninety-one million, eight hundred fifty-three thousand, five hundred twenty-one".