231445312 has 28 divisors (see below), whose sum is σ = 524885920. Its totient is φ = 99190656.

The previous prime is 231445241. The next prime is 231445321. The reversal of 231445312 is 213544132.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-4 number, since 4×231445312⁴ (a number of 35 digits) contains 4444 as substring.

It is a nialpdrome in base 5.

It is a congruent number.

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, 257862 + ... + 258757.

Almost surely, 2^231445312 is an apocalyptic number.

It is an amenable number.

231445312 is an abundant number, since it is smaller than the sum of its proper divisors (293440608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231445312 is an equidigital number, since it uses as much as digits as its factorization.

231445312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516638 (or 516628 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 231445312 is about 15213.3267893646. The cubic root of 231445312 is about 613.9732682254.

Adding to 231445312 its reverse (213544132), we get a palindrome (444989444).

The spelling of 231445312 in words is "two hundred thirty-one million, four hundred forty-five thousand, three hundred twelve".