7220261 has 2 divisors, whose sum is σ = 7220262. Its totient is φ = 7220260.

The previous prime is 7220249. The next prime is 7220263. The reversal of 7220261 is 1620227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6791236 + 429025 = 2606^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7220261 is a prime.

Together with 7220263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7220263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610130 + 3610131.

It is an arithmetic number, because the mean of its divisors is an integer number (3610131).

Almost surely, 2^7220261 is an apocalyptic number.

It is an amenable number.

7220261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7220261 is an equidigital number, since it uses as much as digits as its factorization.

7220261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 7220261 is about 2687.0543351410. The cubic root of 7220261 is about 193.2788348834.

Adding to 7220261 its reverse (1620227), we get a palindrome (8840488).

The spelling of 7220261 in words is "seven million, two hundred twenty thousand, two hundred sixty-one".