133145247 has 4 divisors (see below), whose sum is σ = 177527000. Its totient is φ = 88763496.

The previous prime is 133145239. The next prime is 133145251. The reversal of 133145247 is 742541331.

It is a happy number.

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

It is not a de Polignac number, because 133145247 - 2³ = 133145239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133145267) 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, 22190872 + ... + 22190877.

It is an arithmetic number, because the mean of its divisors is an integer number (44381750).

Almost surely, 2^133145247 is an apocalyptic number.

133145247 is a deficient number, since it is larger than the sum of its proper divisors (44381753).

133145247 is an equidigital number, since it uses as much as digits as its factorization.

133145247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44381752.

The product of its digits is 10080, while the sum is 30.

The square root of 133145247 is about 11538.8581324150. The cubic root of 133145247 is about 510.6326213327.

Adding to 133145247 its reverse (742541331), we get a palindrome (875686578).

The spelling of 133145247 in words is "one hundred thirty-three million, one hundred forty-five thousand, two hundred forty-seven".