218070091 has 2 divisors, whose sum is σ = 218070092. Its totient is φ = 218070090.

The previous prime is 218070079. The next prime is 218070113. The reversal of 218070091 is 190070812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218070091 - 2⁷ = 218069963 is a prime.

It is not a weakly prime, because it can be changed into another prime (218070031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109035045 + 109035046.

It is an arithmetic number, because the mean of its divisors is an integer number (109035046).

Almost surely, 2^218070091 is an apocalyptic number.

218070091 is a deficient number, since it is larger than the sum of its proper divisors (1).

218070091 is an equidigital number, since it uses as much as digits as its factorization.

218070091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 218070091 is about 14767.1964502406. The cubic root of 218070091 is about 601.9106600975.

The spelling of 218070091 in words is "two hundred eighteen million, seventy thousand, ninety-one".