133087581 has 12 divisors (see below), whose sum is σ = 209713920. Its totient is φ = 80659080.

The previous prime is 133087579. The next prime is 133087601. The reversal of 133087581 is 185780331.

It is not a de Polignac number, because 133087581 - 2¹ = 133087579 is a prime.

It is a super-2 number, since 2×133087581² = 35424608432863122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133087561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672061 + ... + 672258.

It is an arithmetic number, because the mean of its divisors is an integer number (17476160).

Almost surely, 2^133087581 is an apocalyptic number.

133087581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133087581 is a deficient number, since it is larger than the sum of its proper divisors (76626339).

133087581 is a wasteful number, since it uses less digits than its factorization.

133087581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344336 (or 1344333 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 133087581 is about 11536.3590876845. The cubic root of 133087581 is about 510.5588913435.

The spelling of 133087581 in words is "one hundred thirty-three million, eighty-seven thousand, five hundred eighty-one".