133257289 has 4 divisors (see below), whose sum is σ = 145371600. Its totient is φ = 121142980.

The previous prime is 133257283. The next prime is 133257307. The reversal of 133257289 is 982752331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982752331 = 11 ⋅89341121.

It is a cyclic number.

It is not a de Polignac number, because 133257289 - 2³ = 133257281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133257281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6057139 + ... + 6057160.

It is an arithmetic number, because the mean of its divisors is an integer number (36342900).

Almost surely, 2^133257289 is an apocalyptic number.

It is an amenable number.

133257289 is a deficient number, since it is larger than the sum of its proper divisors (12114311).

133257289 is a wasteful number, since it uses less digits than its factorization.

133257289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12114310.

The product of its digits is 90720, while the sum is 40.

The square root of 133257289 is about 11543.7120979345. The cubic root of 133257289 is about 510.7758139760.

The spelling of 133257289 in words is "one hundred thirty-three million, two hundred fifty-seven thousand, two hundred eighty-nine".