181256849 has 2 divisors, whose sum is σ = 181256850. Its totient is φ = 181256848.

The previous prime is 181256843. The next prime is 181256851. The reversal of 181256849 is 948652181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143520400 + 37736449 = 11980^2 + 6143^2 .

It is a cyclic number.

It is not a de Polignac number, because 181256849 - 2⁴ = 181256833 is a prime.

Together with 181256851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181256843) 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, 90628424 + 90628425.

It is an arithmetic number, because the mean of its divisors is an integer number (90628425).

Almost surely, 2^181256849 is an apocalyptic number.

It is an amenable number.

181256849 is a deficient number, since it is larger than the sum of its proper divisors (1).

181256849 is an equidigital number, since it uses as much as digits as its factorization.

181256849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 181256849 is about 13463.1663809076. The cubic root of 181256849 is about 565.9327262125.

The spelling of 181256849 in words is "one hundred eighty-one million, two hundred fifty-six thousand, eight hundred forty-nine".