163731399121 has 4 divisors (see below), whose sum is σ = 172348841200. Its totient is φ = 155113957044.

The previous prime is 163731399079. The next prime is 163731399133. The reversal of 163731399121 is 121993137361.

163731399121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 de Polignac number, because none of the positive numbers 2^k-163731399121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163731399421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4308721011 + ... + 4308721048.

It is an arithmetic number, because the mean of its divisors is an integer number (43087210300).

Almost surely, 2^163731399121 is an apocalyptic number.

It is an amenable number.

163731399121 is a deficient number, since it is larger than the sum of its proper divisors (8617442079).

163731399121 is an equidigital number, since it uses as much as digits as its factorization.

163731399121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8617442078.

The product of its digits is 183708, while the sum is 46.

The spelling of 163731399121 in words is "one hundred sixty-three billion, seven hundred thirty-one million, three hundred ninety-nine thousand, one hundred twenty-one".