231228561 has 16 divisors (see below), whose sum is σ = 316330560. Its totient is φ = 150151680.

The previous prime is 231228551. The next prime is 231228563. The reversal of 231228561 is 165822132.

It is not a de Polignac number, because 231228561 - 2⁷ = 231228433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231228563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107545 + ... + 109673.

It is an arithmetic number, because the mean of its divisors is an integer number (19770660).

Almost surely, 2^231228561 is an apocalyptic number.

It is an amenable number.

231228561 is a deficient number, since it is larger than the sum of its proper divisors (85101999).

231228561 is a wasteful number, since it uses less digits than its factorization.

231228561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056.

The product of its digits is 5760, while the sum is 30.

The square root of 231228561 is about 15206.2013994291. The cubic root of 231228561 is about 613.7815441939.

The spelling of 231228561 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, five hundred sixty-one".