381106321 has 2 divisors, whose sum is σ = 381106322. Its totient is φ = 381106320.

The previous prime is 381106279. The next prime is 381106337. The reversal of 381106321 is 123601183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362521600 + 18584721 = 19040^2 + 4311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381106321 is a prime.

It is not a weakly prime, because it can be changed into another prime (381106421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190553160 + 190553161.

It is an arithmetic number, because the mean of its divisors is an integer number (190553161).

Almost surely, 2^381106321 is an apocalyptic number.

It is an amenable number.

381106321 is a deficient number, since it is larger than the sum of its proper divisors (1).

381106321 is an equidigital number, since it uses as much as digits as its factorization.

381106321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 381106321 is about 19521.9446008844. The cubic root of 381106321 is about 725.0178804944.

The spelling of 381106321 in words is "three hundred eighty-one million, one hundred six thousand, three hundred twenty-one".