11903991819 has 8 divisors (see below), whose sum is σ = 15879984960. Its totient is φ = 7931996616.

The previous prime is 11903991797. The next prime is 11903991823. The reversal of 11903991819 is 91819930911.

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

It is not a de Polignac number, because 11903991819 - 2⁷ = 11903991691 is a prime.

It is a super-2 number, since 2×11903991819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11903991419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992529 + ... + 1004450.

It is an arithmetic number, because the mean of its divisors is an integer number (1984998120).

Almost surely, 2^11903991819 is an apocalyptic number.

11903991819 is a deficient number, since it is larger than the sum of its proper divisors (3975993141).

11903991819 is a wasteful number, since it uses less digits than its factorization.

11903991819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998969.

The product of its (nonzero) digits is 157464, while the sum is 51.

The spelling of 11903991819 in words is "eleven billion, nine hundred three million, nine hundred ninety-one thousand, eight hundred nineteen".