231242357 has 2 divisors, whose sum is σ = 231242358. Its totient is φ = 231242356.

The previous prime is 231242309. The next prime is 231242359. The reversal of 231242357 is 753242132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222427396 + 8814961 = 14914^2 + 2969^2 .

It is a cyclic number.

It is not a de Polignac number, because 231242357 - 2¹⁸ = 230980213 is a prime.

Together with 231242359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231242359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621178 + 115621179.

It is an arithmetic number, because the mean of its divisors is an integer number (115621179).

Almost surely, 2^231242357 is an apocalyptic number.

It is an amenable number.

231242357 is a deficient number, since it is larger than the sum of its proper divisors (1).

231242357 is an equidigital number, since it uses as much as digits as its factorization.

231242357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 29.

The square root of 231242357 is about 15206.6550233771. The cubic root of 231242357 is about 613.7937508200.

Adding to 231242357 its reverse (753242132), we get a palindrome (984484489).

The spelling of 231242357 in words is "two hundred thirty-one million, two hundred forty-two thousand, three hundred fifty-seven".