231231845 has 16 divisors (see below), whose sum is σ = 304465392. Its totient is φ = 167531520.

The previous prime is 231231829. The next prime is 231231853. The reversal of 231231845 is 548132132.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5541316 + 225690529 = 2354^2 + 15023^2 .

It is not a de Polignac number, because 231231845 - 2⁴ = 231231829 is a prime.

It is a super-2 number, since 2×231231845² = 106936332284208050, which contains 22 as substring.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 30116 + ... + 37005.

It is an arithmetic number, because the mean of its divisors is an integer number (19029087).

Almost surely, 2^231231845 is an apocalyptic number.

It is an amenable number.

231231845 is a deficient number, since it is larger than the sum of its proper divisors (73233547).

231231845 is a wasteful number, since it uses less digits than its factorization.

231231845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67192.

The product of its digits is 5760, while the sum is 29.

The square root of 231231845 is about 15206.3093813062. The cubic root of 231231845 is about 613.7844499034.

Adding to 231231845 its reverse (548132132), we get a palindrome (779363977).

The spelling of 231231845 in words is "two hundred thirty-one million, two hundred thirty-one thousand, eight hundred forty-five".