133280639 has 4 divisors (see below), whose sum is σ = 133309224. Its totient is φ = 133252056.

The previous prime is 133280599. The next prime is 133280659. The reversal of 133280639 is 936082331.

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

It is a cyclic number.

It is not a de Polignac number, because 133280639 - 2¹² = 133276543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133280599 and 133280608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133280659) 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, 5492 + ... + 17225.

It is an arithmetic number, because the mean of its divisors is an integer number (33327306).

Almost surely, 2^133280639 is an apocalyptic number.

133280639 is a deficient number, since it is larger than the sum of its proper divisors (28585).

133280639 is an equidigital number, since it uses as much as digits as its factorization.

133280639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28584.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 133280639 is about 11544.7234267435. The cubic root of 133280639 is about 510.8056457868.

The spelling of 133280639 in words is "one hundred thirty-three million, two hundred eighty thousand, six hundred thirty-nine".