7113721 has 2 divisors, whose sum is σ = 7113722. Its totient is φ = 7113720.

The previous prime is 7113719. The next prime is 7113727. The reversal of 7113721 is 1273117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5588496 + 1525225 = 2364^2 + 1235^2 .

It is an emirp because it is prime and its reverse (1273117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7113721 - 2¹ = 7113719 is a prime.

Together with 7113719, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7113692 and 7113701.

It is not a weakly prime, because it can be changed into another prime (7113727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3556860 + 3556861.

It is an arithmetic number, because the mean of its divisors is an integer number (3556861).

Almost surely, 2^7113721 is an apocalyptic number.

It is an amenable number.

7113721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7113721 is an equidigital number, since it uses as much as digits as its factorization.

7113721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294, while the sum is 22.

The square root of 7113721 is about 2667.1559759414. The cubic root of 7113721 is about 192.3234655247.

Adding to 7113721 its reverse (1273117), we get a palindrome (8386838).

The spelling of 7113721 in words is "seven million, one hundred thirteen thousand, seven hundred twenty-one".