610721 has 2 divisors, whose sum is σ = 610722. Its totient is φ = 610720.

The previous prime is 610703. The next prime is 610733. The reversal of 610721 is 127016.

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., 555025 + 55696 = 745^2 + 236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-610721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 610721.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 610721.

It is not a weakly prime, because it can be changed into another prime (610741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305360 + 305361.

It is an arithmetic number, because the mean of its divisors is an integer number (305361).

2⁶¹⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

610721 is a deficient number, since it is larger than the sum of its proper divisors (1).

610721 is an equidigital number, since it uses as much as digits as its factorization.

610721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 610721 is about 781.4864042323. The cubic root of 610721 is about 84.8426616507.

Adding to 610721 its reverse (127016), we get a palindrome (737737).

It can be divided in two parts, 610 and 721, that added together give a palindrome (1331).

The spelling of 610721 in words is "six hundred ten thousand, seven hundred twenty-one".