133131439 has 8 divisors (see below), whose sum is σ = 156262688. Its totient is φ = 111028320.

The previous prime is 133131413. The next prime is 133131443. The reversal of 133131439 is 934131331.

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

It is a cyclic number.

It is not a de Polignac number, because 133131439 - 2¹⁵ = 133098671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133134439) 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, 256752 + ... + 257269.

It is an arithmetic number, because the mean of its divisors is an integer number (19532836).

Almost surely, 2^133131439 is an apocalyptic number.

133131439 is a deficient number, since it is larger than the sum of its proper divisors (23131249).

133131439 is an equidigital number, since it uses as much as digits as its factorization.

133131439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514065.

The product of its digits is 2916, while the sum is 28.

The square root of 133131439 is about 11538.2597908003. The cubic root of 133131439 is about 510.6149687837.

The spelling of 133131439 in words is "one hundred thirty-three million, one hundred thirty-one thousand, four hundred thirty-nine".