381279139 has 2 divisors, whose sum is σ = 381279140. Its totient is φ = 381279138.

The previous prime is 381279133. The next prime is 381279149. The reversal of 381279139 is 931972183.

It is a weak prime.

It is an emirp because it is prime and its reverse (931972183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381279139 - 2¹³ = 381270947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381279095 and 381279104.

It is not a weakly prime, because it can be changed into another prime (381279133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190639569 + 190639570.

It is an arithmetic number, because the mean of its divisors is an integer number (190639570).

Almost surely, 2^381279139 is an apocalyptic number.

381279139 is a deficient number, since it is larger than the sum of its proper divisors (1).

381279139 is an equidigital number, since it uses as much as digits as its factorization.

381279139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 381279139 is about 19526.3703488385. The cubic root of 381279139 is about 725.1274537717.

The spelling of 381279139 in words is "three hundred eighty-one million, two hundred seventy-nine thousand, one hundred thirty-nine".