181336249 has 2 divisors, whose sum is σ = 181336250. Its totient is φ = 181336248.

The previous prime is 181336219. The next prime is 181336271. The reversal of 181336249 is 942633181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166590649 + 14745600 = 12907^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 181336249 - 2²¹ = 179239097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181336219) 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, 90668124 + 90668125.

It is an arithmetic number, because the mean of its divisors is an integer number (90668125).

Almost surely, 2^181336249 is an apocalyptic number.

It is an amenable number.

181336249 is a deficient number, since it is larger than the sum of its proper divisors (1).

181336249 is an equidigital number, since it uses as much as digits as its factorization.

181336249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 181336249 is about 13466.1148443046. The cubic root of 181336249 is about 566.0153502144.

The spelling of 181336249 in words is "one hundred eighty-one million, three hundred thirty-six thousand, two hundred forty-nine".