391220121022193 has 8 divisors (see below), whose sum is σ = 400762442412360. Its totient is φ = 381677817118720.

The previous prime is 391220121022189. The next prime is 391220121022223.

391220121022193 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 96869550426289 + 294350570595904 = 9842233^2 + 17156648^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391220121022193 - 2² = 391220121022189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391220121042193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48674021 + ... + 56139117.

It is an arithmetic number, because the mean of its divisors is an integer number (50095305301545).

Almost surely, 2^{391220121022193} is an apocalyptic number.

It is an amenable number.

391220121022193 is a deficient number, since it is larger than the sum of its proper divisors (9542321390167).

391220121022193 is a wasteful number, since it uses less digits than its factorization.

391220121022193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8743347.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 391220121022193 in words is "three hundred ninety-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred ninety-three".