218052139 has 2 divisors, whose sum is σ = 218052140. Its totient is φ = 218052138.

The previous prime is 218052091. The next prime is 218052161. The reversal of 218052139 is 931250812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218052139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218052139.

It is not a weakly prime, because it can be changed into another prime (218052169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109026069 + 109026070.

It is an arithmetic number, because the mean of its divisors is an integer number (109026070).

Almost surely, 2^218052139 is an apocalyptic number.

218052139 is a deficient number, since it is larger than the sum of its proper divisors (1).

218052139 is an equidigital number, since it uses as much as digits as its factorization.

218052139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 218052139 is about 14766.5886040074. The cubic root of 218052139 is about 601.8941427832.

The spelling of 218052139 in words is "two hundred eighteen million, fifty-two thousand, one hundred thirty-nine".