135251443 has 4 divisors (see below), whose sum is σ = 142369960. Its totient is φ = 128132928.

The previous prime is 135251429. The next prime is 135251449. The reversal of 135251443 is 344152531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344152531 = 3691 ⋅93241.

It is a cyclic number.

It is not a de Polignac number, because 135251443 - 2⁵ = 135251411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135251449) 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, 3559230 + ... + 3559267.

It is an arithmetic number, because the mean of its divisors is an integer number (35592490).

Almost surely, 2^135251443 is an apocalyptic number.

135251443 is a deficient number, since it is larger than the sum of its proper divisors (7118517).

135251443 is an equidigital number, since it uses as much as digits as its factorization.

135251443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7118516.

The product of its digits is 7200, while the sum is 28.

The square root of 135251443 is about 11629.7653888632. The cubic root of 135251443 is about 513.3110764605.

The spelling of 135251443 in words is "one hundred thirty-five million, two hundred fifty-one thousand, four hundred forty-three".