183901661 has 2 divisors, whose sum is σ = 183901662. Its totient is φ = 183901660.

The previous prime is 183901609. The next prime is 183901693. The reversal of 183901661 is 166109381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155875225 + 28026436 = 12485^2 + 5294^2 .

It is a cyclic number.

It is not a de Polignac number, because 183901661 - 2¹⁸ = 183639517 is a prime.

It is a Sophie Germain 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 (183901061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91950830 + 91950831.

It is an arithmetic number, because the mean of its divisors is an integer number (91950831).

Almost surely, 2^183901661 is an apocalyptic number.

It is an amenable number.

183901661 is a deficient number, since it is larger than the sum of its proper divisors (1).

183901661 is an equidigital number, since it uses as much as digits as its factorization.

183901661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 183901661 is about 13561.0346581668. The cubic root of 183901661 is about 568.6720507269.

The spelling of 183901661 in words is "one hundred eighty-three million, nine hundred one thousand, six hundred sixty-one".