133631785 has 16 divisors (see below), whose sum is σ = 186273792. Its totient is φ = 90129600.

The previous prime is 133631779. The next prime is 133631803. The reversal of 133631785 is 587136331.

It is a happy number.

It is not a de Polignac number, because 133631785 - 2¹¹ = 133629737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 29161 + ... + 33430.

It is an arithmetic number, because the mean of its divisors is an integer number (11642112).

Almost surely, 2^133631785 is an apocalyptic number.

It is an amenable number.

133631785 is a deficient number, since it is larger than the sum of its proper divisors (52642007).

133631785 is an equidigital number, since it uses as much as digits as its factorization.

133631785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62664.

The product of its digits is 45360, while the sum is 37.

The square root of 133631785 is about 11559.9214962732. The cubic root of 133631785 is about 511.2538480869.

The spelling of 133631785 in words is "one hundred thirty-three million, six hundred thirty-one thousand, seven hundred eighty-five".