30506513 has 4 divisors (see below), whose sum is σ = 30700980. Its totient is φ = 30312048.

The previous prime is 30506491. The next prime is 30506519. The reversal of 30506513 is 31560503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31560503 = 13 ⋅2427731.

It can be written as a sum of positive squares in 2 ways, for example, as 17205904 + 13300609 = 4148^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 30506513 - 2¹⁸ = 30244369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30506519) 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 3 ways as a sum of consecutive naturals, for example, 96998 + ... + 97311.

It is an arithmetic number, because the mean of its divisors is an integer number (7675245).

Almost surely, 2^30506513 is an apocalyptic number.

It is an amenable number.

30506513 is a deficient number, since it is larger than the sum of its proper divisors (194467).

30506513 is a wasteful number, since it uses less digits than its factorization.

30506513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194466.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 30506513 is about 5523.2701364319. The cubic root of 30506513 is about 312.4622264743.

The spelling of 30506513 in words is "thirty million, five hundred six thousand, five hundred thirteen".