30247281 has 6 divisors (see below), whose sum is σ = 43690530. Its totient is φ = 20164848.

The previous prime is 30247279. The next prime is 30247291. The reversal of 30247281 is 18274203.

It can be written as a sum of positive squares in only one way, i.e., 17715681 + 12531600 = 4209^2 + 3540^2 .

It is not a de Polignac number, because 30247281 - 2¹ = 30247279 is a prime.

It is a super-2 number, since 2×30247281² = 1829796015785922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30247201) 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 5 ways as a sum of consecutive naturals, for example, 1680396 + ... + 1680413.

It is an arithmetic number, because the mean of its divisors is an integer number (7281755).

Almost surely, 2^30247281 is an apocalyptic number.

It is an amenable number.

30247281 is a deficient number, since it is larger than the sum of its proper divisors (13443249).

30247281 is a wasteful number, since it uses less digits than its factorization.

30247281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360815 (or 3360812 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 30247281 is about 5499.7528126271. The cubic root of 30247281 is about 311.5746484363.

The spelling of 30247281 in words is "thirty million, two hundred forty-seven thousand, two hundred eighty-one".