218081139 has 8 divisors (see below), whose sum is σ = 291256320. Its totient is φ = 145146696.

The previous prime is 218081137. The next prime is 218081153. The reversal of 218081139 is 931180812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218081139 - 2¹ = 218081137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218081137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58059 + ... + 61700.

It is an arithmetic number, because the mean of its divisors is an integer number (36407040).

Almost surely, 2^218081139 is an apocalyptic number.

218081139 is a deficient number, since it is larger than the sum of its proper divisors (73175181).

218081139 is a wasteful number, since it uses less digits than its factorization.

218081139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120369.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 218081139 is about 14767.5705178611. The cubic root of 218081139 is about 601.9208247142.

The spelling of 218081139 in words is "two hundred eighteen million, eighty-one thousand, one hundred thirty-nine".