231511124240000 has 640 divisors, whose sum is σ = 647487637632000. Its totient is φ = 81709954560000.

The previous prime is 231511124239939. The next prime is 231511124240009. The reversal of 231511124240000 is 42421115132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is not an unprimeable number, because it can be changed into a prime (231511124240009) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4101651779 + ... + 4101708221.

It is an arithmetic number, because the mean of its divisors is an integer number (1011699433800).

Almost surely, 2^{231511124240000} is an apocalyptic number.

231511124240000 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 231511124240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323743818816000).

231511124240000 is an abundant number, since it is smaller than the sum of its proper divisors (415976513392000).

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

231511124240000 is an equidigital number, since it uses as much as digits as its factorization.

231511124240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56626 (or 56599 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 231511124240000 its reverse (42421115132), we get a palindrome (231553545355132).

The spelling of 231511124240000 in words is "two hundred thirty-one trillion, five hundred eleven billion, one hundred twenty-four million, two hundred forty thousand".