231330657 has 4 divisors (see below), whose sum is σ = 308440880. Its totient is φ = 154220436.

The previous prime is 231330653. The next prime is 231330661. The reversal of 231330657 is 756033132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (231330653) and next prime (231330661).

It is not a de Polignac number, because 231330657 - 2² = 231330653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231330653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38555107 + ... + 38555112.

It is an arithmetic number, because the mean of its divisors is an integer number (77110220).

Almost surely, 2^231330657 is an apocalyptic number.

It is an amenable number.

231330657 is a deficient number, since it is larger than the sum of its proper divisors (77110223).

231330657 is an equidigital number, since it uses as much as digits as its factorization.

231330657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77110222.

The product of its (nonzero) digits is 11340, while the sum is 30.

The square root of 231330657 is about 15209.5580803651. The cubic root of 231330657 is about 613.8718666864.

Adding to 231330657 its reverse (756033132), we get a palindrome (987363789).

The spelling of 231330657 in words is "two hundred thirty-one million, three hundred thirty thousand, six hundred fifty-seven".