7213709 has 2 divisors, whose sum is σ = 7213710. Its totient is φ = 7213708.

The previous prime is 7213699. The next prime is 7213747. The reversal of 7213709 is 9073127.

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., 7171684 + 42025 = 2678^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 7213709 - 2¹² = 7209613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7213769) 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, 3606854 + 3606855.

It is an arithmetic number, because the mean of its divisors is an integer number (3606855).

Almost surely, 2^7213709 is an apocalyptic number.

It is an amenable number.

7213709 is a deficient number, since it is larger than the sum of its proper divisors (1).

7213709 is an equidigital number, since it uses as much as digits as its factorization.

7213709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 7213709 is about 2685.8348795114. The cubic root of 7213709 is about 193.2203537947.

The spelling of 7213709 in words is "seven million, two hundred thirteen thousand, seven hundred nine".