231433657 has 16 divisors (see below), whose sum is σ = 285288192. Its totient is φ = 182825280.

The previous prime is 231433621. The next prime is 231433663. The reversal of 231433657 is 756334132.

It is a cyclic number.

It is not a de Polignac number, because 231433657 - 2¹⁹ = 230909369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231433607) 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, 70932 + ... + 74122.

It is an arithmetic number, because the mean of its divisors is an integer number (17830512).

Almost surely, 2^231433657 is an apocalyptic number.

It is an amenable number.

231433657 is a deficient number, since it is larger than the sum of its proper divisors (53854535).

231433657 is a wasteful number, since it uses less digits than its factorization.

231433657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008.

The product of its digits is 45360, while the sum is 34.

The square root of 231433657 is about 15212.9437322301. The cubic root of 231433657 is about 613.9629620059.

Adding to 231433657 its reverse (756334132), we get a palindrome (987767789).

The spelling of 231433657 in words is "two hundred thirty-one million, four hundred thirty-three thousand, six hundred fifty-seven".