218117953 has 8 divisors (see below), whose sum is σ = 225386496. Its totient is φ = 210864000.

The previous prime is 218117927. The next prime is 218117957. The reversal of 218117953 is 359711812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218117953 - 2¹³ = 218109761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218117957) 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, 32625 + ... + 38737.

It is an arithmetic number, because the mean of its divisors is an integer number (28173312).

Almost surely, 2^218117953 is an apocalyptic number.

It is an amenable number.

218117953 is a deficient number, since it is larger than the sum of its proper divisors (7268543).

218117953 is a wasteful number, since it uses less digits than its factorization.

218117953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7295.

The product of its digits is 15120, while the sum is 37.

The square root of 218117953 is about 14768.8169126711. The cubic root of 218117953 is about 601.9546926384.

The spelling of 218117953 in words is "two hundred eighteen million, one hundred seventeen thousand, nine hundred fifty-three".