73691 has 4 divisors (see below), whose sum is σ = 75000. Its totient is φ = 72384.

The previous prime is 73681. The next prime is 73693. The reversal of 73691 is 19637.

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: 19637 = 73 ⋅269.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73691 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 73691.

It is not an unprimeable number, because it can be changed into a prime (73693) 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, 566 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (18750).

2⁷³⁶⁹¹ is an apocalyptic number.

73691 is a deficient number, since it is larger than the sum of its proper divisors (1309).

73691 is a wasteful number, since it uses less digits than its factorization.

73691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its digits is 1134, while the sum is 26.

The square root of 73691 is about 271.4608627408. The cubic root of 73691 is about 41.9248467072.

The spelling of 73691 in words is "seventy-three thousand, six hundred ninety-one".