218479031 has 4 divisors (see below), whose sum is σ = 219926064. Its totient is φ = 217032000.

The previous prime is 218479021. The next prime is 218479033. The reversal of 218479031 is 130974812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218479031 is a prime.

It is a super-2 number, since 2×218479031² = 95466173973397922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 218478982 and 218479000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218479033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723290 + ... + 723591.

It is an arithmetic number, because the mean of its divisors is an integer number (54981516).

Almost surely, 2^218479031 is an apocalyptic number.

218479031 is a deficient number, since it is larger than the sum of its proper divisors (1447033).

218479031 is a wasteful number, since it uses less digits than its factorization.

218479031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447032.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 218479031 is about 14781.0361950710. The cubic root of 218479031 is about 602.2866732124.

The spelling of 218479031 in words is "two hundred eighteen million, four hundred seventy-nine thousand, thirty-one".