231221752547 has 2 divisors, whose sum is σ = 231221752548. Its totient is φ = 231221752546.

The previous prime is 231221752493. The next prime is 231221752627. The reversal of 231221752547 is 745257122132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231221752547 - 2²⁶ = 231154643683 is a prime.

It is a super-2 number, since 2×231221752547² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231221742547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610876273 + 115610876274.

It is an arithmetic number, because the mean of its divisors is an integer number (115610876274).

Almost surely, 2^231221752547 is an apocalyptic number.

231221752547 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221752547 is an equidigital number, since it uses as much as digits as its factorization.

231221752547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235200, while the sum is 41.

Adding to 231221752547 its reverse (745257122132), we get a palindrome (976478874679).

The spelling of 231221752547 in words is "two hundred thirty-one billion, two hundred twenty-one million, seven hundred fifty-two thousand, five hundred forty-seven".