36391 has 4 divisors (see below), whose sum is σ = 36784. Its totient is φ = 36000.

The previous prime is 36389. The next prime is 36433. The reversal of 36391 is 19363.

36391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 5-Lehmer number, since φ(36391) divides (36391-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 36391 - 2¹ = 36389 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 (36341) 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, 31 + ... + 271.

It is an arithmetic number, because the mean of its divisors is an integer number (9196).

2³⁶³⁹¹ is an apocalyptic number.

36391 is a deficient number, since it is larger than the sum of its proper divisors (393).

36391 is a wasteful number, since it uses less digits than its factorization.

36391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392.

The product of its digits is 486, while the sum is 22.

The square root of 36391 is about 190.7642524164. The cubic root of 36391 is about 33.1383842911.

It can be divided in two parts, 363 and 91, that multiplied together give a palindrome (33033).

The spelling of 36391 in words is "thirty-six thousand, three hundred ninety-one".