231061212 has 144 divisors (see below), whose sum is σ = 655724160. Its totient is φ = 68253696.

The previous prime is 231061211. The next prime is 231061213. The reversal of 231061212 is 212160132.

It is an interprime number because it is at equal distance from previous prime (231061211) and next prime (231061213).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231061211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 834018 + ... + 834294.

It is an arithmetic number, because the mean of its divisors is an integer number (4553640).

Almost surely, 2^231061212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231061212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327862080).

231061212 is an abundant number, since it is smaller than the sum of its proper divisors (424662948).

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

231061212 is a wasteful number, since it uses less digits than its factorization.

231061212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 375 counting only the distinct ones).

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

The square root of 231061212 is about 15200.6977471431. The cubic root of 231061212 is about 613.6334360234.

The spelling of 231061212 in words is "two hundred thirty-one million, sixty-one thousand, two hundred twelve".