213737973161 has 4 divisors (see below), whose sum is σ = 213782571732. Its totient is φ = 213693374592.

The previous prime is 213737973083. The next prime is 213737973179. The reversal of 213737973161 is 161379737312.

213737973161 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.

It can be written as a sum of positive squares in 2 ways, for example, as 79594515625 + 134143457536 = 282125^2 + 366256^2 .

It is a cyclic number.

It is not a de Polignac number, because 213737973161 - 2¹⁸ = 213737711017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213737973961) 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, 22292096 + ... + 22301681.

It is an arithmetic number, because the mean of its divisors is an integer number (53445642933).

Almost surely, 2^213737973161 is an apocalyptic number.

It is an amenable number.

213737973161 is a deficient number, since it is larger than the sum of its proper divisors (44598571).

213737973161 is an equidigital number, since it uses as much as digits as its factorization.

213737973161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44598570.

The product of its digits is 1000188, while the sum is 50.

The spelling of 213737973161 in words is "two hundred thirteen billion, seven hundred thirty-seven million, nine hundred seventy-three thousand, one hundred sixty-one".