218853881 has 2 divisors, whose sum is σ = 218853882. Its totient is φ = 218853880.

The previous prime is 218853863. The next prime is 218853911. The reversal of 218853881 is 188358812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177315856 + 41538025 = 13316^2 + 6445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218853881 is a prime.

It is a super-2 number, since 2×218853881² = 95794042457524322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218853821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109426940 + 109426941.

It is an arithmetic number, because the mean of its divisors is an integer number (109426941).

Almost surely, 2^218853881 is an apocalyptic number.

It is an amenable number.

218853881 is a deficient number, since it is larger than the sum of its proper divisors (1).

218853881 is an equidigital number, since it uses as much as digits as its factorization.

218853881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122880, while the sum is 44.

The square root of 218853881 is about 14793.7108596863. The cubic root of 218853881 is about 602.6309292312.

The spelling of 218853881 in words is "two hundred eighteen million, eight hundred fifty-three thousand, eight hundred eighty-one".