391490444161 has 4 divisors (see below), whose sum is σ = 412095204400. Its totient is φ = 370885683924.

The previous prime is 391490444083. The next prime is 391490444183. The reversal of 391490444161 is 161444094193.

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 391490444161 - 2¹⁷ = 391490313089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391490424161) 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, 10302380091 + ... + 10302380128.

It is an arithmetic number, because the mean of its divisors is an integer number (103023801100).

Almost surely, 2^391490444161 is an apocalyptic number.

It is an amenable number.

391490444161 is a deficient number, since it is larger than the sum of its proper divisors (20604760239).

391490444161 is a wasteful number, since it uses less digits than its factorization.

391490444161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20604760238.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 391490444161 in words is "three hundred ninety-one billion, four hundred ninety million, four hundred forty-four thousand, one hundred sixty-one".