133128245 has 4 divisors (see below), whose sum is σ = 159753900. Its totient is φ = 106502592.

The previous prime is 133128217. The next prime is 133128251. The reversal of 133128245 is 542821331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542821331 = 13 ⋅41755487.

It can be written as a sum of positive squares in 2 ways, for example, as 106357969 + 26770276 = 10313^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 133128245 - 2²⁰ = 132079669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13312820 + ... + 13312829.

It is an arithmetic number, because the mean of its divisors is an integer number (39938475).

Almost surely, 2^133128245 is an apocalyptic number.

It is an amenable number.

133128245 is a deficient number, since it is larger than the sum of its proper divisors (26625655).

133128245 is an equidigital number, since it uses as much as digits as its factorization.

133128245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26625654.

The product of its digits is 5760, while the sum is 29.

The square root of 133128245 is about 11538.1213808835. The cubic root of 133128245 is about 510.6108853073.

Adding to 133128245 its reverse (542821331), we get a palindrome (675949576).

The spelling of 133128245 in words is "one hundred thirty-three million, one hundred twenty-eight thousand, two hundred forty-five".