133425551 has 4 divisors (see below), whose sum is σ = 152486352. Its totient is φ = 114364752.

The previous prime is 133425547. The next prime is 133425557. The reversal of 133425551 is 155524331.

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 133425551 - 2² = 133425547 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 (133425557) 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, 9530390 + ... + 9530403.

It is an arithmetic number, because the mean of its divisors is an integer number (38121588).

Almost surely, 2^133425551 is an apocalyptic number.

133425551 is a deficient number, since it is larger than the sum of its proper divisors (19060801).

133425551 is an equidigital number, since it uses as much as digits as its factorization.

133425551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19060800.

The product of its digits is 9000, while the sum is 29.

The square root of 133425551 is about 11550.9978356850. The cubic root of 133425551 is about 510.9907065659.

Adding to 133425551 its reverse (155524331), we get a palindrome (288949882).

The spelling of 133425551 in words is "one hundred thirty-three million, four hundred twenty-five thousand, five hundred fifty-one".