231213446 has 4 divisors (see below), whose sum is σ = 346820172. Its totient is φ = 115606722.

The previous prime is 231213443. The next prime is 231213461. The reversal of 231213446 is 644312132.

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

It is a super-2 number, since 2×231213446² = 106919315222389832, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57803360 + ... + 57803363.

It is an arithmetic number, because the mean of its divisors is an integer number (86705043).

Almost surely, 2^231213446 is an apocalyptic number.

231213446 is a deficient number, since it is larger than the sum of its proper divisors (115606726).

231213446 is a wasteful number, since it uses less digits than its factorization.

231213446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115606725.

The product of its digits is 3456, while the sum is 26.

The square root of 231213446 is about 15205.7043901294. The cubic root of 231213446 is about 613.7681699663.

Adding to 231213446 its reverse (644312132), we get a palindrome (875525578).

The spelling of 231213446 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred forty-six".