30805521 has 4 divisors (see below), whose sum is σ = 41074032. Its totient is φ = 20537012.

The previous prime is 30805519. The next prime is 30805529. The reversal of 30805521 is 12550803.

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.

It is a cyclic number.

It is not a de Polignac number, because 30805521 - 2¹ = 30805519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30805491 and 30805500.

It is not an unprimeable number, because it can be changed into a prime (30805529) 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 in 3 ways as a sum of consecutive naturals, for example, 5134251 + ... + 5134256.

It is an arithmetic number, because the mean of its divisors is an integer number (10268508).

Almost surely, 2^30805521 is an apocalyptic number.

It is an amenable number.

30805521 is a deficient number, since it is larger than the sum of its proper divisors (10268511).

30805521 is a wasteful number, since it uses less digits than its factorization.

30805521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10268510.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 30805521 is about 5550.2721554893. The cubic root of 30805521 is about 313.4797699656.

The spelling of 30805521 in words is "thirty million, eight hundred five thousand, five hundred twenty-one".