8113621 has 4 divisors (see below), whose sum is σ = 8251200. Its totient is φ = 7976044.

The previous prime is 8113601. The next prime is 8113631. The reversal of 8113621 is 1263118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1263118 = 2 ⋅631559.

It is a cyclic number.

It is not a de Polignac number, because 8113621 - 2⁹ = 8113109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8113592 and 8113601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8113601) 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, 68701 + ... + 68818.

It is an arithmetic number, because the mean of its divisors is an integer number (2062800).

Almost surely, 2^8113621 is an apocalyptic number.

It is an amenable number.

8113621 is a deficient number, since it is larger than the sum of its proper divisors (137579).

8113621 is a wasteful number, since it uses less digits than its factorization.

8113621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137578.

The product of its digits is 288, while the sum is 22.

The square root of 8113621 is about 2848.4418547690. The cubic root of 8113621 is about 200.9423941584.

Adding to 8113621 its reverse (1263118), we get a palindrome (9376739).

The spelling of 8113621 in words is "eight million, one hundred thirteen thousand, six hundred twenty-one".