499661 has 2 divisors, whose sum is σ = 499662. Its totient is φ = 499660.

The previous prime is 499649. The next prime is 499663. The reversal of 499661 is 166994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498436 + 1225 = 706^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-499661 is a prime.

It is a super-2 number, since 2×499661² = 499322229842, which contains 22 as substring.

Together with 499663, it forms a pair of twin primes.

It is a Chen prime.

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 499661.

It is not a weakly prime, because it can be changed into another prime (499663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249830 + 249831.

It is an arithmetic number, because the mean of its divisors is an integer number (249831).

2⁴⁹⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

499661 is a deficient number, since it is larger than the sum of its proper divisors (1).

499661 is an equidigital number, since it uses as much as digits as its factorization.

499661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 499661 is about 706.8670313432. The cubic root of 499661 is about 79.3521109111.

The spelling of 499661 in words is "four hundred ninety-nine thousand, six hundred sixty-one".