231212541647 has 2 divisors, whose sum is σ = 231212541648. Its totient is φ = 231212541646.

The previous prime is 231212541629. The next prime is 231212541661. The reversal of 231212541647 is 746145212132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231212541647 - 2¹⁶ = 231212476111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231212541647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231212541947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606270823 + 115606270824.

It is an arithmetic number, because the mean of its divisors is an integer number (115606270824).

Almost surely, 2^231212541647 is an apocalyptic number.

231212541647 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212541647 is an equidigital number, since it uses as much as digits as its factorization.

231212541647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

Adding to 231212541647 its reverse (746145212132), we get a palindrome (977357753779).

The spelling of 231212541647 in words is "two hundred thirty-one billion, two hundred twelve million, five hundred forty-one thousand, six hundred forty-seven".