133087381 has 24 divisors (see below), whose sum is σ = 164150880. Its totient is φ = 107285472.

The previous prime is 133087379. The next prime is 133087411. The reversal of 133087381 is 183780331.

It is not a de Polignac number, because 133087381 - 2¹ = 133087379 is a prime.

It is a super-2 number, since 2×133087381² = 35424501962878322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133087301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151315 + ... + 152191.

It is an arithmetic number, because the mean of its divisors is an integer number (6839620).

Almost surely, 2^133087381 is an apocalyptic number.

It is an amenable number.

133087381 is a deficient number, since it is larger than the sum of its proper divisors (31063499).

133087381 is a wasteful number, since it uses less digits than its factorization.

133087381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 133087381 is about 11536.3504194351. The cubic root of 133087381 is about 510.5586355925.

The spelling of 133087381 in words is "one hundred thirty-three million, eighty-seven thousand, three hundred eighty-one".