133645287 has 4 divisors (see below), whose sum is σ = 178193720. Its totient is φ = 89096856.

The previous prime is 133645273. The next prime is 133645307. The reversal of 133645287 is 782546331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 133645287 - 2⁴ = 133645271 is a prime.

It is a super-2 number, since 2×133645287² = 35722125474624738, 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 (133646287) 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 3 ways as a sum of consecutive naturals, for example, 22274212 + ... + 22274217.

It is an arithmetic number, because the mean of its divisors is an integer number (44548430).

Almost surely, 2^133645287 is an apocalyptic number.

133645287 is a deficient number, since it is larger than the sum of its proper divisors (44548433).

133645287 is an equidigital number, since it uses as much as digits as its factorization.

133645287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44548432.

The product of its digits is 120960, while the sum is 39.

The square root of 133645287 is about 11560.5054820280. The cubic root of 133645287 is about 511.2710663382.

The spelling of 133645287 in words is "one hundred thirty-three million, six hundred forty-five thousand, two hundred eighty-seven".