161500249 has 2 divisors, whose sum is σ = 161500250. Its totient is φ = 161500248.

The previous prime is 161500243. The next prime is 161500259. The reversal of 161500249 is 942005161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161467849 + 32400 = 12707^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 161500249 - 2¹¹ = 161498201 is a prime.

It is not a weakly prime, because it can be changed into another prime (161500243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80750124 + 80750125.

It is an arithmetic number, because the mean of its divisors is an integer number (80750125).

Almost surely, 2^161500249 is an apocalyptic number.

It is an amenable number.

161500249 is a deficient number, since it is larger than the sum of its proper divisors (1).

161500249 is an equidigital number, since it uses as much as digits as its factorization.

161500249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161500249 is about 12708.2748239090. The cubic root of 161500249 is about 544.5750400477.

The spelling of 161500249 in words is "one hundred sixty-one million, five hundred thousand, two hundred forty-nine".