91532621 has 2 divisors, whose sum is σ = 91532622. Its totient is φ = 91532620.

The previous prime is 91532611. The next prime is 91532627. The reversal of 91532621 is 12623519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 25110121 = 8150^2 + 5011^2 .

It is an emirp because it is prime and its reverse (12623519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91532621 - 2¹⁸ = 91270477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91532627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45766310 + 45766311.

It is an arithmetic number, because the mean of its divisors is an integer number (45766311).

Almost surely, 2^91532621 is an apocalyptic number.

It is an amenable number.

91532621 is a deficient number, since it is larger than the sum of its proper divisors (1).

91532621 is an equidigital number, since it uses as much as digits as its factorization.

91532621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 91532621 is about 9567.2682098915. The cubic root of 91532621 is about 450.6699830698.

The spelling of 91532621 in words is "ninety-one million, five hundred thirty-two thousand, six hundred twenty-one".