391426404624193 has 4 divisors (see below), whose sum is σ = 391426601963968. Its totient is φ = 391426207284420.

The previous prime is 391426404624191. The next prime is 391426404624217.

It is a happy number.

391426404624193 is nontrivially palindromic in base 10.

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 391426404624193 - 2¹ = 391426404624191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391426404624191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95664093 + ... + 99671818.

It is an arithmetic number, because the mean of its divisors is an integer number (97856650490992).

Almost surely, 2^{391426404624193} is an apocalyptic number.

It is an amenable number.

391426404624193 is a deficient number, since it is larger than the sum of its proper divisors (197339775).

391426404624193 is a wasteful number, since it uses less digits than its factorization.

391426404624193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197339774.

The product of its (nonzero) digits is 26873856, while the sum is 58.

The spelling of 391426404624193 in words is "three hundred ninety-one trillion, four hundred twenty-six billion, four hundred four million, six hundred twenty-four thousand, one hundred ninety-three".