161873301731 has 2 divisors, whose sum is σ = 161873301732. Its totient is φ = 161873301730.

The previous prime is 161873301719. The next prime is 161873301761. The reversal of 161873301731 is 137103378161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161873301731 - 2¹⁴ = 161873285347 is a prime.

It is a super-2 number, since 2×161873301731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161873301761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80936650865 + 80936650866.

It is an arithmetic number, because the mean of its divisors is an integer number (80936650866).

Almost surely, 2^161873301731 is an apocalyptic number.

161873301731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161873301731 is an equidigital number, since it uses as much as digits as its factorization.

161873301731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

Adding to 161873301731 its reverse (137103378161), we get a palindrome (298976679892).

The spelling of 161873301731 in words is "one hundred sixty-one billion, eight hundred seventy-three million, three hundred one thousand, seven hundred thirty-one".