381242101 has 2 divisors, whose sum is σ = 381242102. Its totient is φ = 381242100.

The previous prime is 381242077. The next prime is 381242137. The reversal of 381242101 is 101242183.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277222500 + 104019601 = 16650^2 + 10199^2 .

It is a cyclic number.

It is not a de Polignac number, because 381242101 - 2⁹ = 381241589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381242161) 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, 190621050 + 190621051.

It is an arithmetic number, because the mean of its divisors is an integer number (190621051).

Almost surely, 2^381242101 is an apocalyptic number.

It is an amenable number.

381242101 is a deficient number, since it is larger than the sum of its proper divisors (1).

381242101 is an equidigital number, since it uses as much as digits as its factorization.

381242101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 381242101 is about 19525.4219160560. The cubic root of 381242101 is about 725.1039730393.

Adding to 381242101 its reverse (101242183), we get a palindrome (482484284).

The spelling of 381242101 in words is "three hundred eighty-one million, two hundred forty-two thousand, one hundred one".