231513454247 has 2 divisors, whose sum is σ = 231513454248. Its totient is φ = 231513454246.

The previous prime is 231513454201. The next prime is 231513454283. The reversal of 231513454247 is 742454315132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231513454247 - 2²⁰ = 231512405671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231513454547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115756727123 + 115756727124.

It is an arithmetic number, because the mean of its divisors is an integer number (115756727124).

Almost surely, 2^231513454247 is an apocalyptic number.

231513454247 is a deficient number, since it is larger than the sum of its proper divisors (1).

231513454247 is an equidigital number, since it uses as much as digits as its factorization.

231513454247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 41.

Adding to 231513454247 its reverse (742454315132), we get a palindrome (973967769379).

The spelling of 231513454247 in words is "two hundred thirty-one billion, five hundred thirteen million, four hundred fifty-four thousand, two hundred forty-seven".