30281 has 4 divisors (see below), whose sum is σ = 30672. Its totient is φ = 29892.

The previous prime is 30271. The next prime is 30293. The reversal of 30281 is 18203.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18203 = 109 ⋅167.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30281 is a prime.

It is a super-2 number, since 2×30281² = 1833877922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30281.

It is not an unprimeable number, because it can be changed into a prime (30211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 248.

It is an arithmetic number, because the mean of its divisors is an integer number (7668).

2³⁰²⁸¹ is an apocalyptic number.

It is an amenable number.

30281 is a deficient number, since it is larger than the sum of its proper divisors (391).

30281 is a wasteful number, since it uses less digits than its factorization.

30281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 30281 is about 174.0143672229. The cubic root of 30281 is about 31.1690384283.

Adding to 30281 its reverse (18203), we get a palindrome (48484).

It can be divided in two parts, 302 and 81, that added together give a palindrome (383).

The spelling of 30281 in words is "thirty thousand, two hundred eighty-one".