53691 has 8 divisors (see below), whose sum is σ = 78144. Its totient is φ = 32520.

The previous prime is 53681. The next prime is 53693. The reversal of 53691 is 19635.

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

It is not a de Polignac number, because 53691 - 2¹⁰ = 52667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53693) 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, 781 + ... + 846.

It is an arithmetic number, because the mean of its divisors is an integer number (9768).

2⁵³⁶⁹¹ is an apocalyptic number.

53691 is a deficient number, since it is larger than the sum of its proper divisors (24453).

53691 is a wasteful number, since it uses less digits than its factorization.

53691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641.

The product of its digits is 810, while the sum is 24.

The square root of 53691 is about 231.7131847781. The cubic root of 53691 is about 37.7253980603.

The spelling of 53691 in words is "fifty-three thousand, six hundred ninety-one".