218480581 has 16 divisors (see below), whose sum is σ = 245710080. Its totient is φ = 192559680.

The previous prime is 218480567. The next prime is 218480609. The reversal of 218480581 is 185084812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 218480581 - 2⁷ = 218480453 is a prime.

It is a super-2 number, since 2×218480581² = 95467528548195122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218480581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218480531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54415 + ... + 58291.

It is an arithmetic number, because the mean of its divisors is an integer number (15356880).

Almost surely, 2^218480581 is an apocalyptic number.

It is an amenable number.

218480581 is a deficient number, since it is larger than the sum of its proper divisors (27229499).

218480581 is a wasteful number, since it uses less digits than its factorization.

218480581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044.

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 218480581 is about 14781.0886270261. The cubic root of 218480581 is about 602.2880975171.

The spelling of 218480581 in words is "two hundred eighteen million, four hundred eighty thousand, five hundred eighty-one".