231724661 has 8 divisors (see below), whose sum is σ = 271287744. Its totient is φ = 193776480.

The previous prime is 231724643. The next prime is 231724679. The reversal of 231724661 is 166427132.

It is an interprime number because it is at equal distance from previous prime (231724643) and next prime (231724679).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231724661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231720661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403415 + ... + 403988.

It is an arithmetic number, because the mean of its divisors is an integer number (33910968).

Almost surely, 2^231724661 is an apocalyptic number.

It is an amenable number.

231724661 is a deficient number, since it is larger than the sum of its proper divisors (39563083).

231724661 is an equidigital number, since it uses as much as digits as its factorization.

231724661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807451.

The product of its digits is 12096, while the sum is 32.

The square root of 231724661 is about 15222.5050829356. The cubic root of 231724661 is about 614.2201859664.

The spelling of 231724661 in words is "two hundred thirty-one million, seven hundred twenty-four thousand, six hundred sixty-one".