218083793 has 2 divisors, whose sum is σ = 218083794. Its totient is φ = 218083792.

The previous prime is 218083783. The next prime is 218083841. The reversal of 218083793 is 397380812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136235584 + 81848209 = 11672^2 + 9047^2 .

It is a cyclic number.

It is not a de Polignac number, because 218083793 - 2¹⁰ = 218082769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218083793.

It is not a weakly prime, because it can be changed into another prime (218083703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109041896 + 109041897.

It is an arithmetic number, because the mean of its divisors is an integer number (109041897).

Almost surely, 2^218083793 is an apocalyptic number.

It is an amenable number.

218083793 is a deficient number, since it is larger than the sum of its proper divisors (1).

218083793 is an equidigital number, since it uses as much as digits as its factorization.

218083793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 218083793 is about 14767.6603766473. The cubic root of 218083793 is about 601.9232664528.

The spelling of 218083793 in words is "two hundred eighteen million, eighty-three thousand, seven hundred ninety-three".