133213445 has 32 divisors (see below), whose sum is σ = 174493440. Its totient is φ = 97254400.

The previous prime is 133213397. The next prime is 133213471. The reversal of 133213445 is 544312331.

It is not a de Polignac number, because 133213445 - 2⁸ = 133213189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 506384 + ... + 506646.

It is an arithmetic number, because the mean of its divisors is an integer number (5452920).

Almost surely, 2^133213445 is an apocalyptic number.

It is an amenable number.

133213445 is a deficient number, since it is larger than the sum of its proper divisors (41279995).

133213445 is a wasteful number, since it uses less digits than its factorization.

133213445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its digits is 4320, while the sum is 26.

The square root of 133213445 is about 11541.8128991940. The cubic root of 133213445 is about 510.7197897453.

Adding to 133213445 its reverse (544312331), we get a palindrome (677525776).

The spelling of 133213445 in words is "one hundred thirty-three million, two hundred thirteen thousand, four hundred forty-five".