30787661 has 2 divisors, whose sum is σ = 30787662. Its totient is φ = 30787660.

The previous prime is 30787651. The next prime is 30787667. The reversal of 30787661 is 16678703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29920900 + 866761 = 5470^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 30787661 - 2¹⁴ = 30771277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30787667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15393830 + 15393831.

It is an arithmetic number, because the mean of its divisors is an integer number (15393831).

Almost surely, 2^30787661 is an apocalyptic number.

It is an amenable number.

30787661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30787661 is an equidigital number, since it uses as much as digits as its factorization.

30787661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 30787661 is about 5548.6629921090. The cubic root of 30787661 is about 313.4191765952.

The spelling of 30787661 in words is "thirty million, seven hundred eighty-seven thousand, six hundred sixty-one".