83491 has 4 divisors (see below), whose sum is σ = 86400. Its totient is φ = 80584.

The previous prime is 83477. The next prime is 83497. The reversal of 83491 is 19438.

83491 = 39² + 40² + ... + 67².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19438 = 2 ⋅9719.

It is a cyclic number.

It is not a de Polignac number, because 83491 - 2⁵ = 83459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2⁸³⁴⁹¹ is an apocalyptic number.

83491 is a deficient number, since it is larger than the sum of its proper divisors (2909).

83491 is a wasteful number, since it uses less digits than its factorization.

83491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908.

The product of its digits is 864, while the sum is 25.

The square root of 83491 is about 288.9480922242. The cubic root of 83491 is about 43.7065527861.

The spelling of 83491 in words is "eighty-three thousand, four hundred ninety-one".