30145281 has 8 divisors (see below), whose sum is σ = 40301280. Its totient is φ = 20043072.

The previous prime is 30145273. The next prime is 30145289. The reversal of 30145281 is 18254103.

It is an interprime number because it is at equal distance from previous prime (30145273) and next prime (30145289).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30145281 - 2³ = 30145273 is a prime.

It is a super-2 number, since 2×30145281² = 1817475933137922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30145289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12120 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (5037660).

Almost surely, 2^30145281 is an apocalyptic number.

It is an amenable number.

30145281 is a deficient number, since it is larger than the sum of its proper divisors (10155999).

30145281 is a wasteful number, since it uses less digits than its factorization.

30145281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26895.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 30145281 is about 5490.4718376475. The cubic root of 30145281 is about 311.2240229284.

Adding to 30145281 its reverse (18254103), we get a palindrome (48399384).

The spelling of 30145281 in words is "thirty million, one hundred forty-five thousand, two hundred eighty-one".