181173796231 has 4 divisors (see below), whose sum is σ = 184244538600. Its totient is φ = 178103053864.

The previous prime is 181173796229. The next prime is 181173796267. The reversal of 181173796231 is 132697371181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 181173796231 - 2¹ = 181173796229 is a prime.

It is a super-2 number, since 2×181173796231² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181173796201) 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, 1535371096 + ... + 1535371213.

It is an arithmetic number, because the mean of its divisors is an integer number (46061134650).

Almost surely, 2^181173796231 is an apocalyptic number.

181173796231 is a deficient number, since it is larger than the sum of its proper divisors (3070742369).

181173796231 is an equidigital number, since it uses as much as digits as its factorization.

181173796231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070742368.

The product of its digits is 381024, while the sum is 49.

The spelling of 181173796231 in words is "one hundred eighty-one billion, one hundred seventy-three million, seven hundred ninety-six thousand, two hundred thirty-one".