108721013 has 4 divisors (see below), whose sum is σ = 108742188. Its totient is φ = 108699840.

The previous prime is 108721007. The next prime is 108721037. The reversal of 108721013 is 310127801.

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: 310127801 = 571 ⋅543131.

It can be written as a sum of positive squares in 2 ways, for example, as 100841764 + 7879249 = 10042^2 + 2807^2 .

It is a cyclic number.

It is not a de Polignac number, because 108721013 - 2⁶ = 108720949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108721013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108721003) 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, 2543 + ... + 14963.

It is an arithmetic number, because the mean of its divisors is an integer number (27185547).

Almost surely, 2^108721013 is an apocalyptic number.

It is an amenable number.

108721013 is a deficient number, since it is larger than the sum of its proper divisors (21175).

108721013 is an equidigital number, since it uses as much as digits as its factorization.

108721013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21174.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 108721013 is about 10426.9368944096. The cubic root of 108721013 is about 477.2777222626.

Adding to 108721013 its reverse (310127801), we get a palindrome (418848814).

The spelling of 108721013 in words is "one hundred eight million, seven hundred twenty-one thousand, thirteen".