133143551 has 4 divisors (see below), whose sum is σ = 133177512. Its totient is φ = 133109592.

The previous prime is 133143547. The next prime is 133143557. The reversal of 133143551 is 155341331.

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

It is a cyclic number.

It is not a de Polignac number, because 133143551 - 2² = 133143547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133143551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133143557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10196 + ... + 19241.

It is an arithmetic number, because the mean of its divisors is an integer number (33294378).

Almost surely, 2^133143551 is an apocalyptic number.

133143551 is a deficient number, since it is larger than the sum of its proper divisors (33961).

133143551 is an equidigital number, since it uses as much as digits as its factorization.

133143551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33960.

The product of its digits is 2700, while the sum is 26.

The square root of 133143551 is about 11538.7846413736. The cubic root of 133143551 is about 510.6304531827.

Adding to 133143551 its reverse (155341331), we get a palindrome (288484882).

The spelling of 133143551 in words is "one hundred thirty-three million, one hundred forty-three thousand, five hundred fifty-one".