30491871919 has 4 divisors (see below), whose sum is σ = 30530617144. Its totient is φ = 30453126696.

The previous prime is 30491871871. The next prime is 30491871941. The reversal of 30491871919 is 91917819403.

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

It is a cyclic number.

It is not a de Polignac number, because 30491871919 - 2⁹ = 30491871407 is a prime.

It is a super-2 number, since 2×30491871919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30491871979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19371432 + ... + 19373005.

It is an arithmetic number, because the mean of its divisors is an integer number (7632654286).

Almost surely, 2^30491871919 is an apocalyptic number.

30491871919 is a deficient number, since it is larger than the sum of its proper divisors (38745225).

30491871919 is an equidigital number, since it uses as much as digits as its factorization.

30491871919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38745224.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 30491871919 in words is "thirty billion, four hundred ninety-one million, eight hundred seventy-one thousand, nine hundred nineteen".