231113521 has 8 divisors (see below), whose sum is σ = 245687904. Its totient is φ = 216648000.

The previous prime is 231113501. The next prime is 231113527. The reversal of 231113521 is 125311132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231113521 - 2⁵ = 231113489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231113527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22815 + ... + 31348.

It is an arithmetic number, because the mean of its divisors is an integer number (30710988).

Almost surely, 2^231113521 is an apocalyptic number.

It is an amenable number.

231113521 is a deficient number, since it is larger than the sum of its proper divisors (14574383).

231113521 is a wasteful number, since it uses less digits than its factorization.

231113521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54431.

The product of its digits is 180, while the sum is 19.

The square root of 231113521 is about 15202.4182615793. The cubic root of 231113521 is about 613.6797385151.

Adding to 231113521 its reverse (125311132), we get a palindrome (356424653).

The spelling of 231113521 in words is "two hundred thirty-one million, one hundred thirteen thousand, five hundred twenty-one".