133281790 has 8 divisors (see below), whose sum is σ = 239907240. Its totient is φ = 53312712.

The previous prime is 133281779. The next prime is 133281791. The reversal of 133281790 is 97182331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133281791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664080 + ... + 6664099.

It is an arithmetic number, because the mean of its divisors is an integer number (29988405).

Almost surely, 2^133281790 is an apocalyptic number.

133281790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133281790 is a deficient number, since it is larger than the sum of its proper divisors (106625450).

133281790 is a wasteful number, since it uses less digits than its factorization.

133281790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13328186.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 133281790 is about 11544.7732762493. The cubic root of 133281790 is about 510.8071162069.

The spelling of 133281790 in words is "one hundred thirty-three million, two hundred eighty-one thousand, seven hundred ninety".