91530541 has 4 divisors (see below), whose sum is σ = 91556284. Its totient is φ = 91504800.

The previous prime is 91530493. The next prime is 91530557. The reversal of 91530541 is 14503519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14503519 = 37 ⋅391987.

It can be written as a sum of positive squares in 2 ways, for example, as 79655625 + 11874916 = 8925^2 + 3446^2 .

It is a cyclic number.

It is not a de Polignac number, because 91530541 - 2⁹ = 91530029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91531541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6480 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (22889071).

Almost surely, 2^91530541 is an apocalyptic number.

It is an amenable number.

91530541 is a deficient number, since it is larger than the sum of its proper divisors (25743).

91530541 is a wasteful number, since it uses less digits than its factorization.

91530541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25742.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 91530541 is about 9567.1595053077. The cubic root of 91530541 is about 450.6665693481. Note that the first 3 decimals are identical.

The spelling of 91530541 in words is "ninety-one million, five hundred thirty thousand, five hundred forty-one".