391312213193 has 6 divisors (see below), whose sum is σ = 430120036122. Its totient is φ = 355738375520.

The previous prime is 391312213151. The next prime is 391312213207.

391312213193 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 267152529424 + 124159683769 = 516868^2 + 352363^2 .

It is not a de Polignac number, because 391312213193 - 2⁶ = 391312213129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391312213493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1616992496 + ... + 1616992737.

It is an arithmetic number, because the mean of its divisors is an integer number (71686672687).

Almost surely, 2^391312213193 is an apocalyptic number.

It is an amenable number.

391312213193 is a deficient number, since it is larger than the sum of its proper divisors (38807822929).

391312213193 is a wasteful number, since it uses less digits than its factorization.

391312213193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233985255 (or 3233985244 counting only the distinct ones).

The product of its digits is 26244, while the sum is 38.

The spelling of 391312213193 in words is "three hundred ninety-one billion, three hundred twelve million, two hundred thirteen thousand, one hundred ninety-three".