135861443 has 4 divisors (see below), whose sum is σ = 138752160. Its totient is φ = 132970728.

The previous prime is 135861421. The next prime is 135861469. The reversal of 135861443 is 344168531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344168531 = 7 ⋅49166933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135861443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135861403) 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, 1445288 + ... + 1445381.

It is an arithmetic number, because the mean of its divisors is an integer number (34688040).

Almost surely, 2^135861443 is an apocalyptic number.

135861443 is a deficient number, since it is larger than the sum of its proper divisors (2890717).

135861443 is an equidigital number, since it uses as much as digits as its factorization.

135861443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890716.

The product of its digits is 34560, while the sum is 35.

The square root of 135861443 is about 11655.9616934854. The cubic root of 135861443 is about 514.0816170919.

The spelling of 135861443 in words is "one hundred thirty-five million, eight hundred sixty-one thousand, four hundred forty-three".