133213503 has 8 divisors (see below), whose sum is σ = 186966400. Its totient is φ = 84134808.

The previous prime is 133213499. The next prime is 133213511. The reversal of 133213503 is 305312331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133213503 - 2² = 133213499 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 133213503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133213583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1168483 + ... + 1168596.

It is an arithmetic number, because the mean of its divisors is an integer number (23370800).

Almost surely, 2^133213503 is an apocalyptic number.

133213503 is a deficient number, since it is larger than the sum of its proper divisors (53752897).

133213503 is a wasteful number, since it uses less digits than its factorization.

133213503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337101.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 133213503 is about 11541.8154117972. The cubic root of 133213503 is about 510.7198638663.

Adding to 133213503 its reverse (305312331), we get a palindrome (438525834).

The spelling of 133213503 in words is "one hundred thirty-three million, two hundred thirteen thousand, five hundred three".