218148839 has 2 divisors, whose sum is σ = 218148840. Its totient is φ = 218148838.

The previous prime is 218148809. The next prime is 218148881. The reversal of 218148839 is 938841812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218148839 - 2¹⁶ = 218083303 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218148839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218148809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109074419 + 109074420.

It is an arithmetic number, because the mean of its divisors is an integer number (109074420).

Almost surely, 2^218148839 is an apocalyptic number.

218148839 is a deficient number, since it is larger than the sum of its proper divisors (1).

218148839 is an equidigital number, since it uses as much as digits as its factorization.

218148839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 218148839 is about 14769.8625247495. The cubic root of 218148839 is about 601.9831040169.

The spelling of 218148839 in words is "two hundred eighteen million, one hundred forty-eight thousand, eight hundred thirty-nine".