218861401 has 8 divisors (see below), whose sum is σ = 245211264. Its totient is φ = 193587120.

The previous prime is 218861393. The next prime is 218861407. The reversal of 218861401 is 104168812.

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 218861401 - 2³ = 218861393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218861407) 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, 268465 + ... + 269278.

It is an arithmetic number, because the mean of its divisors is an integer number (30651408).

Almost surely, 2^218861401 is an apocalyptic number.

It is an amenable number.

218861401 is a deficient number, since it is larger than the sum of its proper divisors (26349863).

218861401 is a wasteful number, since it uses less digits than its factorization.

218861401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537791.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 218861401 is about 14793.9650195612. The cubic root of 218861401 is about 602.6378314509.

The spelling of 218861401 in words is "two hundred eighteen million, eight hundred sixty-one thousand, four hundred one".