508661 has 2 divisors, whose sum is σ = 508662. Its totient is φ = 508660.

The previous prime is 508643. The next prime is 508693. The reversal of 508661 is 166805.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323761 + 184900 = 569^2 + 430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-508661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

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 508661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (508621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254330 + 254331.

It is an arithmetic number, because the mean of its divisors is an integer number (254331).

2⁵⁰⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

508661 is a deficient number, since it is larger than the sum of its proper divisors (1).

508661 is an equidigital number, since it uses as much as digits as its factorization.

508661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 508661 is about 713.2047391878. The cubic root of 508661 is about 79.8257143321.

The spelling of 508661 in words is "five hundred eight thousand, six hundred sixty-one".