181340231 has 2 divisors, whose sum is σ = 181340232. Its totient is φ = 181340230.

The previous prime is 181340227. The next prime is 181340317. The reversal of 181340231 is 132043181.

It is a weak prime.

It is an emirp because it is prime and its reverse (132043181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181340231 - 2² = 181340227 is a prime.

It is a super-2 number, since 2×181340231² = 65768558758266722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 181340197 and 181340206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181340431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90670115 + 90670116.

It is an arithmetic number, because the mean of its divisors is an integer number (90670116).

Almost surely, 2^181340231 is an apocalyptic number.

181340231 is a deficient number, since it is larger than the sum of its proper divisors (1).

181340231 is an equidigital number, since it uses as much as digits as its factorization.

181340231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 181340231 is about 13466.2626960861. The cubic root of 181340231 is about 566.0194932666.

The spelling of 181340231 in words is "one hundred eighty-one million, three hundred forty thousand, two hundred thirty-one".