231430033040520 has 128 divisors (see below), whose sum is σ = 710637864330240. Its totient is φ = 60262354871040.

The previous prime is 231430033040513. The next prime is 231430033040537. The reversal of 231430033040520 is 25040330034132.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11841115 + ... + 24557525.

It is an arithmetic number, because the mean of its divisors is an integer number (5551858315080).

Almost surely, 2^{231430033040520} is an apocalyptic number.

231430033040520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231430033040520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355318932165120).

231430033040520 is an abundant number, since it is smaller than the sum of its proper divisors (479207831289720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231430033040520 is a wasteful number, since it uses less digits than its factorization.

231430033040520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12719995 (or 12719991 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 231430033040520 its reverse (25040330034132), we get a palindrome (256470363074652).

The spelling of 231430033040520 in words is "two hundred thirty-one trillion, four hundred thirty billion, thirty-three million, forty thousand, five hundred twenty".