391330106881 has 4 divisors (see below), whose sum is σ = 447234407872. Its totient is φ = 335425805892.

The previous prime is 391330106861. The next prime is 391330106891. The reversal of 391330106881 is 188601033193.

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 391330106881 - 2¹⁹ = 391329582593 is a prime.

It is a super-2 number, since 2×391330106881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391330106861) 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, 27952150485 + ... + 27952150498.

It is an arithmetic number, because the mean of its divisors is an integer number (111808601968).

Almost surely, 2^391330106881 is an apocalyptic number.

It is an amenable number.

391330106881 is a deficient number, since it is larger than the sum of its proper divisors (55904300991).

391330106881 is an equidigital number, since it uses as much as digits as its factorization.

391330106881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55904300990.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 391330106881 in words is "three hundred ninety-one billion, three hundred thirty million, one hundred six thousand, eight hundred eighty-one".