30855191 has 4 divisors (see below), whose sum is σ = 30922584. Its totient is φ = 30787800.

The previous prime is 30855173. The next prime is 30855193. The reversal of 30855191 is 19155803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19155803 = 23 ⋅832861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30855191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30855193) 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, 33005 + ... + 33926.

It is an arithmetic number, because the mean of its divisors is an integer number (7730646).

Almost surely, 2^30855191 is an apocalyptic number.

30855191 is a deficient number, since it is larger than the sum of its proper divisors (67393).

30855191 is an equidigital number, since it uses as much as digits as its factorization.

30855191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67392.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 30855191 is about 5554.7449086344. The cubic root of 30855191 is about 313.6481616332.

The spelling of 30855191 in words is "thirty million, eight hundred fifty-five thousand, one hundred ninety-one".