91285541 has 2 divisors, whose sum is σ = 91285542. Its totient is φ = 91285540.

The previous prime is 91285507. The next prime is 91285573. The reversal of 91285541 is 14558219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50708641 + 40576900 = 7121^2 + 6370^2 .

It is a cyclic number.

It is not a de Polignac number, because 91285541 - 2¹⁰ = 91284517 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (91285841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45642770 + 45642771.

It is an arithmetic number, because the mean of its divisors is an integer number (45642771).

Almost surely, 2^91285541 is an apocalyptic number.

It is an amenable number.

91285541 is a deficient number, since it is larger than the sum of its proper divisors (1).

91285541 is an equidigital number, since it uses as much as digits as its factorization.

91285541 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 91285541 is about 9554.3467071276. The cubic root of 91285541 is about 450.2641099812.

The spelling of 91285541 in words is "ninety-one million, two hundred eighty-five thousand, five hundred forty-one".