381242161 has 2 divisors, whose sum is σ = 381242162. Its totient is φ = 381242160.

The previous prime is 381242137. The next prime is 381242203. The reversal of 381242161 is 161242183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348979761 + 32262400 = 18681^2 + 5680^2 .

It is a cyclic number.

It is not a de Polignac number, because 381242161 - 2⁹ = 381241649 is a prime.

It is not a weakly prime, because it can be changed into another prime (381242101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190621080 + 190621081.

It is an arithmetic number, because the mean of its divisors is an integer number (190621081).

Almost surely, 2^381242161 is an apocalyptic number.

It is an amenable number.

381242161 is a deficient number, since it is larger than the sum of its proper divisors (1).

381242161 is an equidigital number, since it uses as much as digits as its factorization.

381242161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 381242161 is about 19525.4234525144. The cubic root of 381242161 is about 725.1040110783.

The spelling of 381242161 in words is "three hundred eighty-one million, two hundred forty-two thousand, one hundred sixty-one".