30985729 has 2 divisors, whose sum is σ = 30985730. Its totient is φ = 30985728.

The previous prime is 30985723. The next prime is 30985753. The reversal of 30985729 is 92758903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28912129 + 2073600 = 5377^2 + 1440^2 .

It is an emirp because it is prime and its reverse (92758903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30985729 - 2¹⁷ = 30854657 is a prime.

It is a super-2 number, since 2×30985729² = 1920230803322882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30985723) 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, 15492864 + 15492865.

It is an arithmetic number, because the mean of its divisors is an integer number (15492865).

Almost surely, 2^30985729 is an apocalyptic number.

It is an amenable number.

30985729 is a deficient number, since it is larger than the sum of its proper divisors (1).

30985729 is an equidigital number, since it uses as much as digits as its factorization.

30985729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 30985729 is about 5566.4826416688. The cubic root of 30985729 is about 314.0898528473.

The spelling of 30985729 in words is "thirty million, nine hundred eighty-five thousand, seven hundred twenty-nine".