231111447 has 16 divisors (see below), whose sum is σ = 372886272. Its totient is φ = 124295040.

The previous prime is 231111431. The next prime is 231111449. The reversal of 231111447 is 744111132.

It is not a de Polignac number, because 231111447 - 2⁴ = 231111431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231111449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323329 + ... + 324042.

It is an arithmetic number, because the mean of its divisors is an integer number (23305392).

Almost surely, 2^231111447 is an apocalyptic number.

231111447 is a deficient number, since it is larger than the sum of its proper divisors (141774825).

231111447 is a wasteful number, since it uses less digits than its factorization.

231111447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647398.

The product of its digits is 672, while the sum is 24.

The square root of 231111447 is about 15202.3500485945. The cubic root of 231111447 is about 613.6779028002.

Adding to 231111447 its reverse (744111132), we get a palindrome (975222579).

The spelling of 231111447 in words is "two hundred thirty-one million, one hundred eleven thousand, four hundred forty-seven".