218422031 has 4 divisors (see below), whose sum is σ = 218786064. Its totient is φ = 218058000.

The previous prime is 218422027. The next prime is 218422037. The reversal of 218422031 is 130224812.

It is a happy number.

218422031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 218422031 - 2² = 218422027 is a prime.

It is a super-2 number, since 2×218422031² = 95416367252329922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218421988 and 218422006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218422037) 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, 181115 + ... + 182316.

It is an arithmetic number, because the mean of its divisors is an integer number (54696516).

Almost surely, 2^218422031 is an apocalyptic number.

218422031 is a deficient number, since it is larger than the sum of its proper divisors (364033).

218422031 is an equidigital number, since it uses as much as digits as its factorization.

218422031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364032.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 218422031 is about 14779.1079230108. The cubic root of 218422031 is about 602.2342908759.

Adding to 218422031 its reverse (130224812), we get a palindrome (348646843).

The spelling of 218422031 in words is "two hundred eighteen million, four hundred twenty-two thousand, thirty-one".