30712681 has 2 divisors, whose sum is σ = 30712682. Its totient is φ = 30712680.

The previous prime is 30712679. The next prime is 30712691. The reversal of 30712681 is 18621703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30702681 + 10000 = 5541^2 + 100^2 .

It is an emirp because it is prime and its reverse (18621703) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30712681 - 2¹ = 30712679 is a prime.

It is a super-2 number, since 2×30712681² = 1886537548415522, which contains 22 as substring.

Together with 30712679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30712601) 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, 15356340 + 15356341.

It is an arithmetic number, because the mean of its divisors is an integer number (15356341).

Almost surely, 2^30712681 is an apocalyptic number.

It is an amenable number.

30712681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30712681 is an equidigital number, since it uses as much as digits as its factorization.

30712681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 30712681 is about 5541.9022907301. The cubic root of 30712681 is about 313.1645369948.

The spelling of 30712681 in words is "thirty million, seven hundred twelve thousand, six hundred eighty-one".