7221961 has 2 divisors, whose sum is σ = 7221962. Its totient is φ = 7221960.

The previous prime is 7221953. The next prime is 7221967. The reversal of 7221961 is 1691227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5148361 + 2073600 = 2269^2 + 1440^2 .

It is an emirp because it is prime and its reverse (1691227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7221961 - 2³ = 7221953 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610980 + 3610981.

It is an arithmetic number, because the mean of its divisors is an integer number (3610981).

Almost surely, 2^7221961 is an apocalyptic number.

It is an amenable number.

7221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221961 is an equidigital number, since it uses as much as digits as its factorization.

7221961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 7221961 is about 2687.3706480499. The cubic root of 7221961 is about 193.2940027670.

The spelling of 7221961 in words is "seven million, two hundred twenty-one thousand, nine hundred sixty-one".