133681042 has 12 divisors (see below), whose sum is σ = 220408398. Its totient is φ = 60764000.

The previous prime is 133681003. The next prime is 133681043. The reversal of 133681042 is 240186331.

It can be written as a sum of positive squares in only one way, i.e., 130622041 + 3059001 = 11429^2 + 1749^2 .

It is a super-3 number, since 3×133681042³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133681042.

It is not an unprimeable number, because it can be changed into a prime (133681043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275959 + ... + 276442.

Almost surely, 2^133681042 is an apocalyptic number.

133681042 is a deficient number, since it is larger than the sum of its proper divisors (86727356).

133681042 is a wasteful number, since it uses less digits than its factorization.

133681042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552425 (or 552414 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 133681042 is about 11562.0518075297. The cubic root of 133681042 is about 511.3166568397.

The spelling of 133681042 in words is "one hundred thirty-three million, six hundred eighty-one thousand, forty-two".