218192473 has 2 divisors, whose sum is σ = 218192474. Its totient is φ = 218192472.

The previous prime is 218192437. The next prime is 218192497. The reversal of 218192473 is 374291812.

Together with previous prime (218192437) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173396224 + 44796249 = 13168^2 + 6693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218192473 is a prime.

It is not a weakly prime, because it can be changed into another prime (218192413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109096236 + 109096237.

It is an arithmetic number, because the mean of its divisors is an integer number (109096237).

Almost surely, 2^218192473 is an apocalyptic number.

It is an amenable number.

218192473 is a deficient number, since it is larger than the sum of its proper divisors (1).

218192473 is an equidigital number, since it uses as much as digits as its factorization.

218192473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 218192473 is about 14771.3395804172. The cubic root of 218192473 is about 602.0232374411.

The spelling of 218192473 in words is "two hundred eighteen million, one hundred ninety-two thousand, four hundred seventy-three".