231533412 has 48 divisors (see below), whose sum is σ = 593644800. Its totient is φ = 69651360.

The previous prime is 231533381. The next prime is 231533431. The reversal of 231533412 is 214335132.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12039 + ... + 24657.

It is an arithmetic number, because the mean of its divisors is an integer number (12367600).

Almost surely, 2^231533412 is an apocalyptic number.

231533412 is a gapful number since it is divisible by the number (22) 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 231533412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296822400).

231533412 is an abundant number, since it is smaller than the sum of its proper divisors (362111388).

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

231533412 is a wasteful number, since it uses less digits than its factorization.

231533412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776 (or 12774 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 231533412 is about 15216.2220015351. Note that the first 3 decimals coincide. The cubic root of 231533412 is about 614.0511616201.

Adding to 231533412 its reverse (214335132), we get a palindrome (445868544).

It can be divided in two parts, 23153 and 3412, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 231533412 in words is "two hundred thirty-one million, five hundred thirty-three thousand, four hundred twelve".