30123681 has 12 divisors (see below), whose sum is σ = 46722672. Its totient is φ = 17213448.

The previous prime is 30123679. The next prime is 30123701. The reversal of 30123681 is 18632103.

It is not a de Polignac number, because 30123681 - 2¹ = 30123679 is a prime.

It is a super-2 number, since 2×30123681² = 1814872313979522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30123631) 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 in 11 ways as a sum of consecutive naturals, for example, 102315 + ... + 102608.

It is an arithmetic number, because the mean of its divisors is an integer number (3893556).

Almost surely, 2^30123681 is an apocalyptic number.

It is an amenable number.

30123681 is a deficient number, since it is larger than the sum of its proper divisors (16598991).

30123681 is a wasteful number, since it uses less digits than its factorization.

30123681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204940 (or 204933 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 30123681 is about 5488.5044411023. The cubic root of 30123681 is about 311.1496713779.

Adding to 30123681 its reverse (18632103), we get a palindrome (48755784).

The spelling of 30123681 in words is "thirty million, one hundred twenty-three thousand, six hundred eighty-one".