135531439 has 2 divisors, whose sum is σ = 135531440. Its totient is φ = 135531438.

The previous prime is 135531379. The next prime is 135531449. The reversal of 135531439 is 934135531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135531439 - 2⁷ = 135531311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135531449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67765719 + 67765720.

It is an arithmetic number, because the mean of its divisors is an integer number (67765720).

Almost surely, 2^135531439 is an apocalyptic number.

135531439 is a deficient number, since it is larger than the sum of its proper divisors (1).

135531439 is an equidigital number, since it uses as much as digits as its factorization.

135531439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 34.

The square root of 135531439 is about 11641.7970691814. The cubic root of 135531439 is about 513.6650492280.

The spelling of 135531439 in words is "one hundred thirty-five million, five hundred thirty-one thousand, four hundred thirty-nine".