391121222121193 has 4 divisors (see below), whose sum is σ = 391130857825408. Its totient is φ = 391111586416980.

The previous prime is 391121222121109. The next prime is 391121222121251.

391121222121193 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 a de Polignac number, because none of the positive numbers 2^k-391121222121193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391121222121293) 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, 4817791221 + ... + 4817872402.

It is an arithmetic number, because the mean of its divisors is an integer number (97782714456352).

Almost surely, 2^{391121222121193} is an apocalyptic number.

It is an amenable number.

391121222121193 is a deficient number, since it is larger than the sum of its proper divisors (9635704215).

391121222121193 is an equidigital number, since it uses as much as digits as its factorization.

391121222121193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9635704214.

The product of its digits is 23328, while the sum is 40.

The spelling of 391121222121193 in words is "three hundred ninety-one trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred ninety-three".