7220981 has 2 divisors, whose sum is σ = 7220982. Its totient is φ = 7220980.

The previous prime is 7220977. The next prime is 7220999. The reversal of 7220981 is 1890227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 538756 = 2585^2 + 734^2 .

It is an emirp because it is prime and its reverse (1890227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7220981 - 2² = 7220977 is a prime.

It is a super-2 number, since 2×7220981² = 104285133204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610490 + 3610491.

It is an arithmetic number, because the mean of its divisors is an integer number (3610491).

Almost surely, 2^7220981 is an apocalyptic number.

It is an amenable number.

7220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7220981 is an equidigital number, since it uses as much as digits as its factorization.

7220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 7220981 is about 2687.1883075066. The cubic root of 7220981 is about 193.2852592188.

The spelling of 7220981 in words is "seven million, two hundred twenty thousand, nine hundred eighty-one".