191919673481 has 4 divisors (see below), whose sum is σ = 192009736464. Its totient is φ = 191829610500.

The previous prime is 191919673471. The next prime is 191919673483. The reversal of 191919673481 is 184376919191.

191919673481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191919673481 - 2¹⁸ = 191919411337 is a prime.

It is a super-2 number, since 2×191919673481² (a number of 23 digits) contains 22 as substring.

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 191919673481.

It is not an unprimeable number, because it can be changed into a prime (191919673483) 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, 45028295 + ... + 45032556.

It is an arithmetic number, because the mean of its divisors is an integer number (48002434116).

Almost surely, 2^191919673481 is an apocalyptic number.

It is an amenable number.

191919673481 is a deficient number, since it is larger than the sum of its proper divisors (90062983).

191919673481 is an equidigital number, since it uses as much as digits as its factorization.

191919673481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90062982.

The product of its digits is 2939328, while the sum is 59.

The spelling of 191919673481 in words is "one hundred ninety-one billion, nine hundred nineteen million, six hundred seventy-three thousand, four hundred eighty-one".