135816563 has 4 divisors (see below), whose sum is σ = 137535840. Its totient is φ = 134097288.

The previous prime is 135816547. The next prime is 135816607. The reversal of 135816563 is 365618531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365618531 = 67 ⋅5456993.

It is a cyclic number.

It is not a de Polignac number, because 135816563 - 2⁴ = 135816547 is a prime.

It is a super-2 number, since 2×135816563² = 36892277570265938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135816523) 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, 859520 + ... + 859677.

It is an arithmetic number, because the mean of its divisors is an integer number (34383960).

Almost surely, 2^135816563 is an apocalyptic number.

135816563 is a deficient number, since it is larger than the sum of its proper divisors (1719277).

135816563 is an equidigital number, since it uses as much as digits as its factorization.

135816563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719276.

The product of its digits is 64800, while the sum is 38.

The square root of 135816563 is about 11654.0363393976. The cubic root of 135816563 is about 514.0250042089.

The spelling of 135816563 in words is "one hundred thirty-five million, eight hundred sixteen thousand, five hundred sixty-three".