218993230631 has 16 divisors (see below), whose sum is σ = 272162385216. Its totient is φ = 171892025856.

The previous prime is 218993230613. The next prime is 218993230639. The reversal of 218993230631 is 136032399812.

218993230631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 218993230631 - 2¹⁴ = 218993214247 is a prime.

It is a super-2 number, since 2×218993230631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218993230639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24864236 + ... + 24873041.

It is an arithmetic number, because the mean of its divisors is an integer number (17010149076).

Almost surely, 2^218993230631 is an apocalyptic number.

218993230631 is a deficient number, since it is larger than the sum of its proper divisors (53169154585).

218993230631 is a wasteful number, since it uses less digits than its factorization.

218993230631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49737338.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 218993230631 in words is "two hundred eighteen billion, nine hundred ninety-three million, two hundred thirty thousand, six hundred thirty-one".