318421139 has 2 divisors, whose sum is σ = 318421140. Its totient is φ = 318421138.

The previous prime is 318421121. The next prime is 318421151. The reversal of 318421139 is 931124813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318421139 - 2¹⁶ = 318355603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318423139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159210569 + 159210570.

It is an arithmetic number, because the mean of its divisors is an integer number (159210570).

Almost surely, 2^318421139 is an apocalyptic number.

318421139 is a deficient number, since it is larger than the sum of its proper divisors (1).

318421139 is an equidigital number, since it uses as much as digits as its factorization.

318421139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 318421139 is about 17844.3587444324. The cubic root of 318421139 is about 682.8636008434.

The spelling of 318421139 in words is "three hundred eighteen million, four hundred twenty-one thousand, one hundred thirty-nine".