30445661 has 2 divisors, whose sum is σ = 30445662. Its totient is φ = 30445660.

The previous prime is 30445651. The next prime is 30445663. The reversal of 30445661 is 16654403.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 14485636 = 3995^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 30445661 - 2¹⁴ = 30429277 is a prime.

It is a Sophie Germain prime.

Together with 30445663, it forms a pair of twin primes.

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 (30445663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15222830 + 15222831.

It is an arithmetic number, because the mean of its divisors is an integer number (15222831).

Almost surely, 2^30445661 is an apocalyptic number.

It is an amenable number.

30445661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30445661 is an equidigital number, since it uses as much as digits as its factorization.

30445661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 30445661 is about 5517.7586935277. The cubic root of 30445661 is about 312.2543297983.

The spelling of 30445661 in words is "thirty million, four hundred forty-five thousand, six hundred sixty-one".