181007231 has 2 divisors, whose sum is σ = 181007232. Its totient is φ = 181007230.

The previous prime is 181007227. The next prime is 181007257. The reversal of 181007231 is 132700181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181007231 - 2² = 181007227 is a prime.

It is a super-2 number, since 2×181007231² = 65527235348574722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181007197 and 181007206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181007201) 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 as a sum of consecutive naturals, namely, 90503615 + 90503616.

It is an arithmetic number, because the mean of its divisors is an integer number (90503616).

Almost surely, 2^181007231 is an apocalyptic number.

181007231 is a deficient number, since it is larger than the sum of its proper divisors (1).

181007231 is an equidigital number, since it uses as much as digits as its factorization.

181007231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 181007231 is about 13453.8927823883. The cubic root of 181007231 is about 565.6728153101.

The spelling of 181007231 in words is "one hundred eighty-one million, seven thousand, two hundred thirty-one".