610661 has 2 divisors, whose sum is σ = 610662. Its totient is φ = 610660.

The previous prime is 610651. The next prime is 610667. The reversal of 610661 is 166016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498436 + 112225 = 706^2 + 335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-610661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305330 + 305331.

It is an arithmetic number, because the mean of its divisors is an integer number (305331).

2⁶¹⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

610661 is a deficient number, since it is larger than the sum of its proper divisors (1).

610661 is an equidigital number, since it uses as much as digits as its factorization.

610661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 610661 is about 781.4480149057. The cubic root of 610661 is about 84.8398831171.

Adding to 610661 its reverse (166016), we get a palindrome (776677).

The spelling of 610661 in words is "six hundred ten thousand, six hundred sixty-one".