218871097 has 4 divisors (see below), whose sum is σ = 218920320. Its totient is φ = 218821876.

The previous prime is 218871077. The next prime is 218871119. The reversal of 218871097 is 790178812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218871097 - 2¹⁵ = 218838329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218871077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17197 + ... + 27082.

It is an arithmetic number, because the mean of its divisors is an integer number (54730080).

Almost surely, 2^218871097 is an apocalyptic number.

It is an amenable number.

218871097 is a deficient number, since it is larger than the sum of its proper divisors (49223).

218871097 is an equidigital number, since it uses as much as digits as its factorization.

218871097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49222.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 218871097 is about 14794.2927171257. The cubic root of 218871097 is about 602.6467306753.

The spelling of 218871097 in words is "two hundred eighteen million, eight hundred seventy-one thousand, ninety-seven".