133231230 has 160 divisors (see below), whose sum is σ = 411903360. Its totient is φ = 30559680.

The previous prime is 133231223. The next prime is 133231271. The reversal of 133231230 is 32132331.

133231230 = 5160² + 5161² + ... + 5164².

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 168897 + ... + 169683.

It is an arithmetic number, because the mean of its divisors is an integer number (2574396).

Almost surely, 2^133231230 is an apocalyptic number.

133231230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 133231230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205951680).

133231230 is an abundant number, since it is smaller than the sum of its proper divisors (278672130).

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

133231230 is a wasteful number, since it uses less digits than its factorization.

133231230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 133231230 is about 11542.5833330325. The cubic root of 133231230 is about 510.7425170490.

Adding to 133231230 its reverse (32132331), we get a palindrome (165363561).

The spelling of 133231230 in words is "one hundred thirty-three million, two hundred thirty-one thousand, two hundred thirty".