191020842019 has 24 divisors (see below), whose sum is σ = 223398744768. Its totient is φ = 162856995840.

The previous prime is 191020841971. The next prime is 191020842031. The reversal of 191020842019 is 910248020191.

It is not a de Polignac number, because 191020842019 - 2⁹ = 191020841507 is a prime.

It is a super-2 number, since 2×191020842019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191020842059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7178499 + ... + 7205059.

It is an arithmetic number, because the mean of its divisors is an integer number (9308281032).

Almost surely, 2^191020842019 is an apocalyptic number.

191020842019 is a deficient number, since it is larger than the sum of its proper divisors (32377902749).

191020842019 is a wasteful number, since it uses less digits than its factorization.

191020842019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27355 (or 27348 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 191020842019 in words is "one hundred ninety-one billion, twenty million, eight hundred forty-two thousand, nineteen".