30643661 has 2 divisors, whose sum is σ = 30643662. Its totient is φ = 30643660.

The previous prime is 30643631. The next prime is 30643667. The reversal of 30643661 is 16634603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22146436 + 8497225 = 4706^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 30643661 - 2¹⁸ = 30381517 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 (30643667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15321830 + 15321831.

It is an arithmetic number, because the mean of its divisors is an integer number (15321831).

Almost surely, 2^30643661 is an apocalyptic number.

It is an amenable number.

30643661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30643661 is an equidigital number, since it uses as much as digits as its factorization.

30643661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 30643661 is about 5535.6716846287. The cubic root of 30643661 is about 312.9297715576.

The spelling of 30643661 in words is "thirty million, six hundred forty-three thousand, six hundred sixty-one".