116521 has 4 divisors (see below), whose sum is σ = 117700. Its totient is φ = 115344.

The previous prime is 116507. The next prime is 116531. The reversal of 116521 is 125611.

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: 125611 = 59 ⋅2129.

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 48400 = 261^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 116521 - 2⁹ = 116009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 116495 and 116504.

It is not an unprimeable number, because it can be changed into a prime (116531) 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, 426 + ... + 643.

It is an arithmetic number, because the mean of its divisors is an integer number (29425).

2¹¹⁶⁵²¹ is an apocalyptic number.

It is an amenable number.

116521 is a deficient number, since it is larger than the sum of its proper divisors (1179).

116521 is a wasteful number, since it uses less digits than its factorization.

116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178.

The product of its digits is 60, while the sum is 16.

The square root of 116521 is about 341.3517247649. The cubic root of 116521 is about 48.8428954110.

The spelling of 116521 in words is "one hundred sixteen thousand, five hundred twenty-one".