19950581091 has 8 divisors (see below), whose sum is σ = 30400885504. Its totient is φ = 11400332040.

The previous prime is 19950581083. The next prime is 19950581111. The reversal of 19950581091 is 19018505991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19950581091 - 2³ = 19950581083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19950581091.

It is not an unprimeable number, because it can be changed into a prime (19950481091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475013815 + ... + 475013856.

It is an arithmetic number, because the mean of its divisors is an integer number (3800110688).

Almost surely, 2^19950581091 is an apocalyptic number.

19950581091 is a deficient number, since it is larger than the sum of its proper divisors (10450304413).

19950581091 is an equidigital number, since it uses as much as digits as its factorization.

19950581091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950027681.

The product of its (nonzero) digits is 145800, while the sum is 48.

The spelling of 19950581091 in words is "nineteen billion, nine hundred fifty million, five hundred eighty-one thousand, ninety-one".