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34721 is a prime number

34721 has 2 divisors, whose sum is σ = 34722. Its totient is φ = 34720.

The previous prime is 34703. The next prime is 34729. The reversal of 34721 is 12743.

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., 30625 + 4096 = 175^2 + 64^2 .

It is an emirp because it is prime and its reverse (12743) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-34721 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 34721.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17360 + 17361.

It is an arithmetic number, because the mean of its divisors is an integer number (17361).

234721 is an apocalyptic number.

It is an amenable number.

34721 is a deficient number, since it is larger than the sum of its proper divisors (1).

34721 is an equidigital number, since it uses as much as digits as its factorization.

34721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 17.

The square root of 34721 is about 186.3357185298. The cubic root of 34721 is about 32.6235142182.

The spelling of 34721 in words is "thirty-four thousand, seven hundred twenty-one".