231015105500 has 96 divisors (see below), whose sum is σ = 518489200320. Its totient is φ = 89853753600.

The previous prime is 231015105493. The next prime is 231015105539. The reversal of 231015105500 is 5501510132.

It is a happy number.

It is a super-3 number, since 3×231015105500³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44193887 + ... + 44199113.

It is an arithmetic number, because the mean of its divisors is an integer number (5400929170).

Almost surely, 2^231015105500 is an apocalyptic number.

231015105500 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 231015105500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259244600160).

231015105500 is an abundant number, since it is smaller than the sum of its proper divisors (287474094820).

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

231015105500 is a wasteful number, since it uses less digits than its factorization.

231015105500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672 (or 7660 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 231015105500 its reverse (5501510132), we get a palindrome (236516615632).

The spelling of 231015105500 in words is "two hundred thirty-one billion, fifteen million, one hundred five thousand, five hundred".