133503506 has 4 divisors (see below), whose sum is σ = 200255262. Its totient is φ = 66751752.

The previous prime is 133503497. The next prime is 133503509. The reversal of 133503506 is 605305331.

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

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 10182481 = 11105^2 + 3191^2 .

It is a super-2 number, since 2×133503506² = 35646372228584072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133503509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33375875 + ... + 33375878.

Almost surely, 2^133503506 is an apocalyptic number.

133503506 is a deficient number, since it is larger than the sum of its proper divisors (66751756).

133503506 is an equidigital number, since it uses as much as digits as its factorization.

133503506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66751755.

The product of its (nonzero) digits is 4050, while the sum is 26.

The square root of 133503506 is about 11554.3717267535. The cubic root of 133503506 is about 511.0902040632.

Adding to 133503506 its reverse (605305331), we get a palindrome (738808837).

The spelling of 133503506 in words is "one hundred thirty-three million, five hundred three thousand, five hundred six".