231531425341521 has 16 divisors (see below), whose sum is σ = 325041834128640. Its totient is φ = 146191922442000.

The previous prime is 231531425341493. The next prime is 231531425341621. The reversal of 231531425341521 is 125143524135132.

It is not a de Polignac number, because 231531425341521 - 2⁹ = 231531425341009 is a prime.

It is a super-2 number, since 2×231531425341521² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231531425341121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533829355 + ... + 534262896.

It is an arithmetic number, because the mean of its divisors is an integer number (20315114633040).

Almost surely, 2^{231531425341521} is an apocalyptic number.

It is an amenable number.

231531425341521 is a deficient number, since it is larger than the sum of its proper divisors (93510408787119).

231531425341521 is a wasteful number, since it uses less digits than its factorization.

231531425341521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068096076.

The product of its digits is 432000, while the sum is 42.

Adding to 231531425341521 its reverse (125143524135132), we get a palindrome (356674949476653).

The spelling of 231531425341521 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, four hundred twenty-five million, three hundred forty-one thousand, five hundred twenty-one".