133375981 has 8 divisors (see below), whose sum is σ = 140881664. Its totient is φ = 126070560.

The previous prime is 133375973. The next prime is 133376003. The reversal of 133375981 is 189573331.

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

It is a cyclic number.

It is not a de Polignac number, because 133375981 - 2³ = 133375973 is a prime.

It is a super-2 number, since 2×133375981² = 35578304615424722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133375181) 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 7 ways as a sum of consecutive naturals, for example, 48696 + ... + 51361.

It is an arithmetic number, because the mean of its divisors is an integer number (17610208).

Almost surely, 2^133375981 is an apocalyptic number.

It is an amenable number.

133375981 is a deficient number, since it is larger than the sum of its proper divisors (7505683).

133375981 is a wasteful number, since it uses less digits than its factorization.

133375981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100131.

The product of its digits is 68040, while the sum is 40.

The square root of 133375981 is about 11548.8519342833. The cubic root of 133375981 is about 510.9274179714.

The spelling of 133375981 in words is "one hundred thirty-three million, three hundred seventy-five thousand, nine hundred eighty-one".