133131546 has 64 divisors (see below), whose sum is σ = 310210560. Its totient is φ = 42269040.

The previous prime is 133131541. The next prime is 133131563. The reversal of 133131546 is 645131331.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (133131541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111565 + ... + 112751.

It is an arithmetic number, because the mean of its divisors is an integer number (4847040).

Almost surely, 2^133131546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133131546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155105280).

133131546 is an abundant number, since it is smaller than the sum of its proper divisors (177079014).

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

133131546 is a wasteful number, since it uses less digits than its factorization.

133131546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1290 counting only the distinct ones).

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

The square root of 133131546 is about 11538.2644275472. The cubic root of 133131546 is about 510.6151055803.

Adding to 133131546 its reverse (645131331), we get a palindrome (778262877).

The spelling of 133131546 in words is "one hundred thirty-three million, one hundred thirty-one thousand, five hundred forty-six".