133491787 has 16 divisors (see below), whose sum is σ = 157651200. Its totient is φ = 111434400.

The previous prime is 133491773. The next prime is 133491791. The reversal of 133491787 is 787194331.

It is not a de Polignac number, because 133491787 - 2¹¹ = 133489739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133491187) 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 15 ways as a sum of consecutive naturals, for example, 26112 + ... + 30802.

It is an arithmetic number, because the mean of its divisors is an integer number (9853200).

Almost surely, 2^133491787 is an apocalyptic number.

133491787 is a deficient number, since it is larger than the sum of its proper divisors (24159413).

133491787 is a wasteful number, since it uses less digits than its factorization.

133491787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914.

The product of its digits is 127008, while the sum is 43.

The square root of 133491787 is about 11553.8645915555. The cubic root of 133491787 is about 511.0752490468.

The spelling of 133491787 in words is "one hundred thirty-three million, four hundred ninety-one thousand, seven hundred eighty-seven".