161725243 has 2 divisors, whose sum is σ = 161725244. Its totient is φ = 161725242.

The previous prime is 161725237. The next prime is 161725253. The reversal of 161725243 is 342527161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161725243 - 2⁵ = 161725211 is a prime.

It is not a weakly prime, because it can be changed into another prime (161725253) 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, 80862621 + 80862622.

It is an arithmetic number, because the mean of its divisors is an integer number (80862622).

Almost surely, 2^161725243 is an apocalyptic number.

161725243 is a deficient number, since it is larger than the sum of its proper divisors (1).

161725243 is an equidigital number, since it uses as much as digits as its factorization.

161725243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 161725243 is about 12717.1240066298. The cubic root of 161725243 is about 544.8278141915.

The spelling of 161725243 in words is "one hundred sixty-one million, seven hundred twenty-five thousand, two hundred forty-three".