231231361 has 4 divisors (see below), whose sum is σ = 231387732. Its totient is φ = 231074992.

The previous prime is 231231353. The next prime is 231231367. The reversal of 231231361 is 163132132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 186595600 + 44635761 = 13660^2 + 6681^2 .

It is a cyclic number.

It is not a de Polignac number, because 231231361 - 2³ = 231231353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231231367) by changing a digit.

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, 75946 + ... + 78931.

It is an arithmetic number, because the mean of its divisors is an integer number (57846933).

Almost surely, 2^231231361 is an apocalyptic number.

It is an amenable number.

231231361 is a deficient number, since it is larger than the sum of its proper divisors (156371).

231231361 is a wasteful number, since it uses less digits than its factorization.

231231361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156370.

The product of its digits is 648, while the sum is 22.

The square root of 231231361 is about 15206.2934668512. The cubic root of 231231361 is about 613.7840216580.

Adding to 231231361 its reverse (163132132), we get a palindrome (394363493).

The spelling of 231231361 in words is "two hundred thirty-one million, two hundred thirty-one thousand, three hundred sixty-one".