133346557 has 4 divisors (see below), whose sum is σ = 136950556. Its totient is φ = 129742560.

The previous prime is 133346539. The next prime is 133346597. The reversal of 133346557 is 755643331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755643331 = 21737 ⋅34763.

It can be written as a sum of positive squares in 2 ways, for example, as 63138916 + 70207641 = 7946^2 + 8379^2 .

It is a cyclic number.

It is not a de Polignac number, because 133346557 - 2¹¹ = 133344509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3603961 = 133346557 / (1 + 3 + 3 + 3 + 4 + 6 + 5 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133346527) 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, 1801944 + ... + 1802017.

It is an arithmetic number, because the mean of its divisors is an integer number (34237639).

Almost surely, 2^133346557 is an apocalyptic number.

It is an amenable number.

133346557 is a deficient number, since it is larger than the sum of its proper divisors (3603999).

133346557 is an equidigital number, since it uses as much as digits as its factorization.

133346557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603998.

The product of its digits is 113400, while the sum is 37.

The square root of 133346557 is about 11547.5779711591. The cubic root of 133346557 is about 510.8898434049.

Adding to 133346557 its reverse (755643331), we get a palindrome (888989888).

It can be divided in two parts, 133346 and 557, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 133346557 in words is "one hundred thirty-three million, three hundred forty-six thousand, five hundred fifty-seven".