231742513 has 2 divisors, whose sum is σ = 231742514. Its totient is φ = 231742512.

The previous prime is 231742493. The next prime is 231742541. The reversal of 231742513 is 315247132.

It is an a-pointer prime, because the next prime (231742541) can be obtained adding 231742513 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158331889 + 73410624 = 12583^2 + 8568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231742513 is a prime.

It is not a weakly prime, because it can be changed into another prime (231742543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115871256 + 115871257.

It is an arithmetic number, because the mean of its divisors is an integer number (115871257).

Almost surely, 2^231742513 is an apocalyptic number.

It is an amenable number.

231742513 is a deficient number, since it is larger than the sum of its proper divisors (1).

231742513 is an equidigital number, since it uses as much as digits as its factorization.

231742513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 231742513 is about 15223.0914403087. The cubic root of 231742513 is about 614.2359586757.

Adding to 231742513 its reverse (315247132), we get a palindrome (546989645).

The spelling of 231742513 in words is "two hundred thirty-one million, seven hundred forty-two thousand, five hundred thirteen".