30638281 has 2 divisors, whose sum is σ = 30638282. Its totient is φ = 30638280.

The previous prime is 30638263. The next prime is 30638299. The reversal of 30638281 is 18283603.

It is a balanced prime because it is at equal distance from previous prime (30638263) and next prime (30638299).

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 4064256 = 5155^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 30638281 - 2⁹ = 30637769 is a prime.

It is a super-2 number, since 2×30638281² = 1877408525269922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30638381) 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, 15319140 + 15319141.

It is an arithmetic number, because the mean of its divisors is an integer number (15319141).

Almost surely, 2^30638281 is an apocalyptic number.

It is an amenable number.

30638281 is a deficient number, since it is larger than the sum of its proper divisors (1).

30638281 is an equidigital number, since it uses as much as digits as its factorization.

30638281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 30638281 is about 5535.1857240747. The cubic root of 30638281 is about 312.9114571585.

The spelling of 30638281 in words is "thirty million, six hundred thirty-eight thousand, two hundred eighty-one".