7311121 has 2 divisors, whose sum is σ = 7311122. Its totient is φ = 7311120.

The previous prime is 7311119. The next prime is 7311127. The reversal of 7311121 is 1211137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 3370896 = 1985^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 7311121 - 2¹ = 7311119 is a prime.

Together with 7311119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 7311095 and 7311104.

It is not a weakly prime, because it can be changed into another prime (7311127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3655560 + 3655561.

It is an arithmetic number, because the mean of its divisors is an integer number (3655561).

Almost surely, 2^7311121 is an apocalyptic number.

It is an amenable number.

7311121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7311121 is an equidigital number, since it uses as much as digits as its factorization.

7311121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42, while the sum is 16.

The square root of 7311121 is about 2703.9084673857. The cubic root of 7311121 is about 194.0862000464.

Adding to 7311121 its sum of digits (16), we get a palindrome (7311137).

Adding to 7311121 its reverse (1211137), we get a palindrome (8522258).

The spelling of 7311121 in words is "seven million, three hundred eleven thousand, one hundred twenty-one".