7221937 has 2 divisors, whose sum is σ = 7221938. Its totient is φ = 7221936.

The previous prime is 7221917. The next prime is 7221953. The reversal of 7221937 is 7391227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4260096 + 2961841 = 2064^2 + 1721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7221899 and 7221908.

It is not a weakly prime, because it can be changed into another prime (7221917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610968 + 3610969.

It is an arithmetic number, because the mean of its divisors is an integer number (3610969).

Almost surely, 2^7221937 is an apocalyptic number.

It is an amenable number.

7221937 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221937 is an equidigital number, since it uses as much as digits as its factorization.

7221937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 31.

The square root of 7221937 is about 2687.3661827150. The cubic root of 7221937 is about 193.2937886487.

The spelling of 7221937 in words is "seven million, two hundred twenty-one thousand, nine hundred thirty-seven".