231222442 has 8 divisors (see below), whose sum is σ = 378364032. Its totient is φ = 105101100.

The previous prime is 231222379. The next prime is 231222487. The reversal of 231222442 is 244222132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 10510111 = 231222442 / (2 + 3 + 1 + 2 + 2 + 2 + 4 + 4 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5255034 + ... + 5255077.

It is an arithmetic number, because the mean of its divisors is an integer number (47295504).

Almost surely, 2^231222442 is an apocalyptic number.

231222442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231222442 is a deficient number, since it is larger than the sum of its proper divisors (147141590).

231222442 is a wasteful number, since it uses less digits than its factorization.

231222442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510124.

The product of its digits is 1536, while the sum is 22.

The square root of 231222442 is about 15206.0001972905. Note that the first 3 decimals coincide. The cubic root of 231222442 is about 613.7761299804.

Adding to 231222442 its reverse (244222132), we get a palindrome (475444574).

The spelling of 231222442 in words is "two hundred thirty-one million, two hundred twenty-two thousand, four hundred forty-two".