191478087793 has 16 divisors (see below), whose sum is σ = 203510845440. Its totient is φ = 180154609728.

The previous prime is 191478087781. The next prime is 191478087803. The reversal of 191478087793 is 397780874191.

It is a happy number.

191478087793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191478087793 - 2¹³ = 191478079601 is a prime.

It is a super-2 number, since 2×191478087793² (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 (191478087763) 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 15 ways as a sum of consecutive naturals, for example, 23101696 + ... + 23109982.

It is an arithmetic number, because the mean of its divisors is an integer number (12719427840).

Almost surely, 2^191478087793 is an apocalyptic number.

It is an amenable number.

191478087793 is a deficient number, since it is larger than the sum of its proper divisors (12032757647).

191478087793 is an frugal number, since it uses more digits than its factorization.

191478087793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13041 (or 13007 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 64.

The spelling of 191478087793 in words is "one hundred ninety-one billion, four hundred seventy-eight million, eighty-seven thousand, seven hundred ninety-three".