133381530 has 48 divisors (see below), whose sum is σ = 357986304. Its totient is φ = 34420320.

The previous prime is 133381529. The next prime is 133381537. The reversal of 133381530 is 35183331.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133381494 and 133381503.

It is not an unprimeable number, because it can be changed into a prime (133381537) 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, 21114 + ... + 26693.

It is an arithmetic number, because the mean of its divisors is an integer number (7458048).

Almost surely, 2^133381530 is an apocalyptic number.

133381530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133381530 is an abundant number, since it is smaller than the sum of its proper divisors (224604774).

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

133381530 is a wasteful number, since it uses less digits than its factorization.

133381530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47851 (or 47848 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 133381530 is about 11549.0921721147. The cubic root of 133381530 is about 510.9345034473.

The spelling of 133381530 in words is "one hundred thirty-three million, three hundred eighty-one thousand, five hundred thirty".