133081844 has 18 divisors (see below), whose sum is σ = 270917010. Its totient is φ = 57034992.

The previous prime is 133081811. The next prime is 133081849. The reversal of 133081844 is 448180331.

It can be written as a sum of positive squares in only one way, i.e., 91968100 + 41113744 = 9590^2 + 6412^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 133081844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133081849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339299 + ... + 339690.

It is an arithmetic number, because the mean of its divisors is an integer number (15050945).

Almost surely, 2^133081844 is an apocalyptic number.

133081844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

133081844 is an abundant number, since it is smaller than the sum of its proper divisors (137835166).

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

133081844 is a wasteful number, since it uses less digits than its factorization.

133081844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679007 (or 678998 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 133081844 is about 11536.1104363646. The cubic root of 133081844 is about 510.5515550255.

The spelling of 133081844 in words is "one hundred thirty-three million, eighty-one thousand, eight hundred forty-four".