161500243 has 2 divisors, whose sum is σ = 161500244. Its totient is φ = 161500242.

The previous prime is 161500223. The next prime is 161500249. The reversal of 161500243 is 342005161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161500243 is a prime.

It is not a weakly prime, because it can be changed into another prime (161500249) 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, 80750121 + 80750122.

It is an arithmetic number, because the mean of its divisors is an integer number (80750122).

Almost surely, 2^161500243 is an apocalyptic number.

161500243 is a deficient number, since it is larger than the sum of its proper divisors (1).

161500243 is an equidigital number, since it uses as much as digits as its factorization.

161500243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 161500243 is about 12708.2745878424. The cubic root of 161500243 is about 544.5750333038.

The spelling of 161500243 in words is "one hundred sixty-one million, five hundred thousand, two hundred forty-three".