231610561 has 8 divisors (see below), whose sum is σ = 285059264. Its totient is φ = 183252240.

The previous prime is 231610543. The next prime is 231610571. The reversal of 231610561 is 165016132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231610561 - 2⁷ = 231610433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231610571) 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 7 ways as a sum of consecutive naturals, for example, 1272495 + ... + 1272676.

It is an arithmetic number, because the mean of its divisors is an integer number (35632408).

Almost surely, 2^231610561 is an apocalyptic number.

It is an amenable number.

231610561 is a deficient number, since it is larger than the sum of its proper divisors (53448703).

231610561 is a wasteful number, since it uses less digits than its factorization.

231610561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545191.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 231610561 is about 15218.7568809019. The cubic root of 231610561 is about 614.1193564894.

Adding to 231610561 its reverse (165016132), we get a palindrome (396626693).

The spelling of 231610561 in words is "two hundred thirty-one million, six hundred ten thousand, five hundred sixty-one".