7212661 has 2 divisors, whose sum is σ = 7212662. Its totient is φ = 7212660.

The previous prime is 7212637. The next prime is 7212703. The reversal of 7212661 is 1662127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4490161 + 2722500 = 2119^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 7212661 - 2¹⁷ = 7081589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7212061) 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, 3606330 + 3606331.

It is an arithmetic number, because the mean of its divisors is an integer number (3606331).

Almost surely, 2^7212661 is an apocalyptic number.

It is an amenable number.

7212661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7212661 is an equidigital number, since it uses as much as digits as its factorization.

7212661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 7212661 is about 2685.6397748023. The cubic root of 7212661 is about 193.2109963921.

Adding to 7212661 its reverse (1662127), we get a palindrome (8874788).

The spelling of 7212661 in words is "seven million, two hundred twelve thousand, six hundred sixty-one".