91529521 has 2 divisors, whose sum is σ = 91529522. Its totient is φ = 91529520.

The previous prime is 91529519. The next prime is 91529551. The reversal of 91529521 is 12592519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 1488400 = 9489^2 + 1220^2 .

It is an emirp because it is prime and its reverse (12592519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91529521 - 2¹ = 91529519 is a prime.

Together with 91529519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91529551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45764760 + 45764761.

It is an arithmetic number, because the mean of its divisors is an integer number (45764761).

Almost surely, 2^91529521 is an apocalyptic number.

It is an amenable number.

91529521 is a deficient number, since it is larger than the sum of its proper divisors (1).

91529521 is an equidigital number, since it uses as much as digits as its factorization.

91529521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 34.

The square root of 91529521 is about 9567.1061978009. The cubic root of 91529521 is about 450.6648952927.

The spelling of 91529521 in words is "ninety-one million, five hundred twenty-nine thousand, five hundred twenty-one".