381366397 has 2 divisors, whose sum is σ = 381366398. Its totient is φ = 381366396.

The previous prime is 381366367. The next prime is 381366407. The reversal of 381366397 is 793663183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 183710916 = 14059^2 + 13554^2 .

It is an emirp because it is prime and its reverse (793663183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381366397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381366317) 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, 190683198 + 190683199.

It is an arithmetic number, because the mean of its divisors is an integer number (190683199).

Almost surely, 2^381366397 is an apocalyptic number.

It is an amenable number.

381366397 is a deficient number, since it is larger than the sum of its proper divisors (1).

381366397 is an equidigital number, since it uses as much as digits as its factorization.

381366397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 381366397 is about 19528.6045840454. The cubic root of 381366397 is about 725.1827661301.

The spelling of 381366397 in words is "three hundred eighty-one million, three hundred sixty-six thousand, three hundred ninety-seven".