4993661 has 2 divisors, whose sum is σ = 4993662. Its totient is φ = 4993660.

The previous prime is 4993627. The next prime is 4993673. The reversal of 4993661 is 1663994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 109561 = 2210^2 + 331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4993661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4993621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496830 + 2496831.

It is an arithmetic number, because the mean of its divisors is an integer number (2496831).

Almost surely, 2^4993661 is an apocalyptic number.

It is an amenable number.

4993661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4993661 is an equidigital number, since it uses as much as digits as its factorization.

4993661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 4993661 is about 2234.6500844651. The cubic root of 4993661 is about 170.9253005240.

The spelling of 4993661 in words is "four million, nine hundred ninety-three thousand, six hundred sixty-one".