231434657 has 2 divisors, whose sum is σ = 231434658. Its totient is φ = 231434656.

The previous prime is 231434629. The next prime is 231434659. The reversal of 231434657 is 756434132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173080336 + 58354321 = 13156^2 + 7639^2 .

It is a cyclic number.

It is not a de Polignac number, because 231434657 - 2¹² = 231430561 is a prime.

Together with 231434659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231434659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115717328 + 115717329.

It is an arithmetic number, because the mean of its divisors is an integer number (115717329).

Almost surely, 2^231434657 is an apocalyptic number.

It is an amenable number.

231434657 is a deficient number, since it is larger than the sum of its proper divisors (1).

231434657 is an equidigital number, since it uses as much as digits as its factorization.

231434657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 35.

The square root of 231434657 is about 15212.9765989434. The cubic root of 231434657 is about 613.9638462940.

Adding to 231434657 its reverse (756434132), we get a palindrome (987868789).

The spelling of 231434657 in words is "two hundred thirty-one million, four hundred thirty-four thousand, six hundred fifty-seven".