113691 has 4 divisors (see below), whose sum is σ = 151592. Its totient is φ = 75792.

The previous prime is 113683. The next prime is 113717. The reversal of 113691 is 196311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196311 = 3 ⋅65437.

It is not a de Polignac number, because 113691 - 2³ = 113683 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113621) 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, 18946 + ... + 18951.

It is an arithmetic number, because the mean of its divisors is an integer number (37898).

2¹¹³⁶⁹¹ is an apocalyptic number.

113691 is a deficient number, since it is larger than the sum of its proper divisors (37901).

113691 is an equidigital number, since it uses as much as digits as its factorization.

113691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37900.

The product of its digits is 162, while the sum is 21.

The square root of 113691 is about 337.1809603166. The cubic root of 113691 is about 48.4442268146. Note that the first 3 decimals are identical.

The spelling of 113691 in words is "one hundred thirteen thousand, six hundred ninety-one".