91538 has 8 divisors (see below), whose sum is σ = 141132. Its totient is φ = 44496.

The previous prime is 91529. The next prime is 91541. The reversal of 91538 is 83519.

It can be written as a sum of positive squares in 2 ways, for example, as 80089 + 11449 = 283^2 + 107^2 .

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

It is an unprimeable number.

91538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 692.

2⁹¹⁵³⁸ is an apocalyptic number.

91538 is a deficient number, since it is larger than the sum of its proper divisors (49594).

91538 is a wasteful number, since it uses less digits than its factorization.

91538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 1080, while the sum is 26.

The square root of 91538 is about 302.5524747874. The cubic root of 91538 is about 45.0678810911.

The spelling of 91538 in words is "ninety-one thousand, five hundred thirty-eight".