231156222 has 48 divisors (see below), whose sum is σ = 511128576. Its totient is φ = 69638800.

The previous prime is 231156209. The next prime is 231156227. The reversal of 231156222 is 222651132.

It is a junction number, because it is equal to n+sod(n) for n = 231156192 and 231156201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231156227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137833 + ... + 139499.

It is an arithmetic number, because the mean of its divisors is an integer number (10648512).

Almost surely, 2^231156222 is an apocalyptic number.

231156222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 231156222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255564288).

231156222 is an abundant number, since it is smaller than the sum of its proper divisors (279972354).

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

231156222 is a wasteful number, since it uses less digits than its factorization.

231156222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885 (or 1874 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 231156222 is about 15203.8226114356. The cubic root of 231156222 is about 613.7175310894.

The spelling of 231156222 in words is "two hundred thirty-one million, one hundred fifty-six thousand, two hundred twenty-two".