30172811 has 4 divisors (see below), whose sum is σ = 30304800. Its totient is φ = 30040824.

The previous prime is 30172783. The next prime is 30172819. The reversal of 30172811 is 11827103.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30172811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30172819) 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, 65651 + ... + 66108.

It is an arithmetic number, because the mean of its divisors is an integer number (7576200).

Almost surely, 2^30172811 is an apocalyptic number.

30172811 is a deficient number, since it is larger than the sum of its proper divisors (131989).

30172811 is a wasteful number, since it uses less digits than its factorization.

30172811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131988.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 30172811 is about 5492.9783360214. The cubic root of 30172811 is about 311.3187352699.

Adding to 30172811 its reverse (11827103), we get a palindrome (41999914).

The spelling of 30172811 in words is "thirty million, one hundred seventy-two thousand, eight hundred eleven".