30661661 has 2 divisors, whose sum is σ = 30661662. Its totient is φ = 30661660.

The previous prime is 30661643. The next prime is 30661669. The reversal of 30661661 is 16616603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27352900 + 3308761 = 5230^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 30661661 - 2¹⁸ = 30399517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30661669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15330830 + 15330831.

It is an arithmetic number, because the mean of its divisors is an integer number (15330831).

Almost surely, 2^30661661 is an apocalyptic number.

It is an amenable number.

30661661 is a deficient number, since it is larger than the sum of its proper divisors (1).

30661661 is an equidigital number, since it uses as much as digits as its factorization.

30661661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 30661661 is about 5537.2972649118. The cubic root of 30661661 is about 312.9910309195.

The spelling of 30661661 in words is "thirty million, six hundred sixty-one thousand, six hundred sixty-one".