91539481 has 8 divisors (see below), whose sum is σ = 99930528. Its totient is φ = 83160000.

The previous prime is 91539479. The next prime is 91539521. The reversal of 91539481 is 18493519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91539481 - 2¹ = 91539479 is a prime.

It is a super-2 number, since 2×91539481² = 16758953163498722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91539401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29326 + ... + 32296.

It is an arithmetic number, because the mean of its divisors is an integer number (12491316).

Almost surely, 2^91539481 is an apocalyptic number.

It is an amenable number.

91539481 is a deficient number, since it is larger than the sum of its proper divisors (8391047).

91539481 is a wasteful number, since it uses less digits than its factorization.

91539481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5783.

The product of its digits is 38880, while the sum is 40.

The square root of 91539481 is about 9567.6267172168. The cubic root of 91539481 is about 450.6812414198.

The spelling of 91539481 in words is "ninety-one million, five hundred thirty-nine thousand, four hundred eighty-one".