231311144 has 8 divisors (see below), whose sum is σ = 433708410. Its totient is φ = 115655568.

The previous prime is 231311107. The next prime is 231311153. The reversal of 231311144 is 441113132.

It can be written as a sum of positive squares in only one way, i.e., 117462244 + 113848900 = 10838^2 + 10670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 14456939 + ... + 14456954.

Almost surely, 2^231311144 is an apocalyptic number.

It is an amenable number.

231311144 is a deficient number, since it is larger than the sum of its proper divisors (202397266).

231311144 is a wasteful number, since it uses less digits than its factorization.

231311144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28913899 (or 28913895 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 231311144 is about 15208.9165952082. The cubic root of 231311144 is about 613.8546059412.

Adding to 231311144 its reverse (441113132), we get a palindrome (672424276).

The spelling of 231311144 in words is "two hundred thirty-one million, three hundred eleven thousand, one hundred forty-four".