135644863 has 4 divisors (see below), whose sum is σ = 136912680. Its totient is φ = 134377048.

The previous prime is 135644801. The next prime is 135644881. The reversal of 135644863 is 368446531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368446531 = 11827 ⋅31153.

It is a cyclic number.

It is not a de Polignac number, because 135644863 - 2²⁵ = 102090431 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135644063) 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, 633748 + ... + 633961.

It is an arithmetic number, because the mean of its divisors is an integer number (34228170).

Almost surely, 2^135644863 is an apocalyptic number.

135644863 is a deficient number, since it is larger than the sum of its proper divisors (1267817).

135644863 is a wasteful number, since it uses less digits than its factorization.

135644863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267816.

The product of its digits is 207360, while the sum is 40.

The square root of 135644863 is about 11646.6674632703. The cubic root of 135644863 is about 513.8083018433.

It can be divided in two parts, 13564486 and 3, that added together give a square (13564489 = 3683²).

The spelling of 135644863 in words is "one hundred thirty-five million, six hundred forty-four thousand, eight hundred sixty-three".