231212160 has 192 divisors, whose sum is σ = 806977080. Its totient is φ = 60997632.

The previous prime is 231212153. The next prime is 231212171. The reversal of 231212160 is 61212132.

It can be written as a sum of positive squares in 4 ways, for example, as 226442304 + 4769856 = 15048^2 + 2184^2 .

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 788974 + ... + 789266.

Almost surely, 2^231212160 is an apocalyptic number.

231212160 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 231212160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403488540).

231212160 is an abundant number, since it is smaller than the sum of its proper divisors (575764920).

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

231212160 is a wasteful number, since it uses less digits than its factorization.

231212160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 231212160 is about 15205.6621033088. The cubic root of 231212160 is about 613.7670320462.

Adding to 231212160 its reverse (61212132), we get a palindrome (292424292).

It can be divided in two parts, 23121 and 2160, that added together give a square (25281 = 159²).

The spelling of 231212160 in words is "two hundred thirty-one million, two hundred twelve thousand, one hundred sixty".