490661 has 2 divisors, whose sum is σ = 490662. Its totient is φ = 490660.

The previous prime is 490643. The next prime is 490663. The reversal of 490661 is 166094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481636 + 9025 = 694^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 490661 - 2¹⁸ = 228517 is a prime.

Together with 490663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 490661.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 490661.

It is not a weakly prime, because it can be changed into another prime (490663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245330 + 245331.

It is an arithmetic number, because the mean of its divisors is an integer number (245331).

2⁴⁹⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

490661 is a deficient number, since it is larger than the sum of its proper divisors (1).

490661 is an equidigital number, since it uses as much as digits as its factorization.

490661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 490661 is about 700.4719837367. The cubic root of 490661 is about 78.8727856954.

The spelling of 490661 in words is "four hundred ninety thousand, six hundred sixty-one".