218813913 has 8 divisors (see below), whose sum is σ = 324168800. Its totient is φ = 145875924.

The previous prime is 218813909. The next prime is 218813957. The reversal of 218813913 is 319318812.

It is not a de Polignac number, because 218813913 - 2² = 218813909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218813983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4052083 + ... + 4052136.

It is an arithmetic number, because the mean of its divisors is an integer number (40521100).

Almost surely, 2^218813913 is an apocalyptic number.

It is an amenable number.

218813913 is a deficient number, since it is larger than the sum of its proper divisors (105354887).

218813913 is an equidigital number, since it uses as much as digits as its factorization.

218813913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104228 (or 8104222 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 218813913 is about 14792.3599537058. The cubic root of 218813913 is about 602.5942420144.

The spelling of 218813913 in words is "two hundred eighteen million, eight hundred thirteen thousand, nine hundred thirteen".