30943681 has 2 divisors, whose sum is σ = 30943682. Its totient is φ = 30943680.

The previous prime is 30943669. The next prime is 30943691. The reversal of 30943681 is 18634903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 11451456 = 4415^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 30943681 - 2¹⁷ = 30812609 is a prime.

It is a super-2 number, since 2×30943681² = 1915022787659522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30943631) 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, 15471840 + 15471841.

It is an arithmetic number, because the mean of its divisors is an integer number (15471841).

Almost surely, 2^30943681 is an apocalyptic number.

It is an amenable number.

30943681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30943681 is an equidigital number, since it uses as much as digits as its factorization.

30943681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 30943681 is about 5562.7044681522. The cubic root of 30943681 is about 313.9477139873.

The spelling of 30943681 in words is "thirty million, nine hundred forty-three thousand, six hundred eighty-one".