218775401 has 12 divisors (see below), whose sum is σ = 244546560. Its totient is φ = 195427440.

The previous prime is 218775377. The next prime is 218775433. The reversal of 218775401 is 104577812.

It is a de Polignac number, because none of the positive numbers 2^k-218775401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218775451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15641 + ... + 26118.

It is an arithmetic number, because the mean of its divisors is an integer number (20378880).

Almost surely, 2^218775401 is an apocalyptic number.

It is an amenable number.

218775401 is a deficient number, since it is larger than the sum of its proper divisors (25771159).

218775401 is a wasteful number, since it uses less digits than its factorization.

218775401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41816 (or 41803 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 218775401 is about 14791.0581433513. The cubic root of 218775401 is about 602.5588870549.

The spelling of 218775401 in words is "two hundred eighteen million, seven hundred seventy-five thousand, four hundred one".