133531439 has 2 divisors, whose sum is σ = 133531440. Its totient is φ = 133531438.

The previous prime is 133531427. The next prime is 133531459. The reversal of 133531439 is 934135331.

It is a weak prime.

It is an emirp because it is prime and its reverse (934135331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133531439 - 2⁴ = 133531423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133531459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66765719 + 66765720.

It is an arithmetic number, because the mean of its divisors is an integer number (66765720).

Almost surely, 2^133531439 is an apocalyptic number.

133531439 is a deficient number, since it is larger than the sum of its proper divisors (1).

133531439 is an equidigital number, since it uses as much as digits as its factorization.

133531439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 32.

The square root of 133531439 is about 11555.5804267895. The cubic root of 133531439 is about 511.1258467904.

The spelling of 133531439 in words is "one hundred thirty-three million, five hundred thirty-one thousand, four hundred thirty-nine".