191990002019 has 4 divisors (see below), whose sum is σ = 191990958000. Its totient is φ = 191989046040.

The previous prime is 191990002003. The next prime is 191990002021. The reversal of 191990002019 is 910200099191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 191990002019 - 2⁴ = 191990002003 is a prime.

It is a super-2 number, since 2×191990002019² (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 (191990002049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47519 + ... + 621480.

It is an arithmetic number, because the mean of its divisors is an integer number (47997739500).

Almost surely, 2^191990002019 is an apocalyptic number.

191990002019 is a deficient number, since it is larger than the sum of its proper divisors (955981).

191990002019 is an equidigital number, since it uses as much as digits as its factorization.

191990002019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955980.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 191990002019 in words is "one hundred ninety-one billion, nine hundred ninety million, two thousand, nineteen".