11913563 has 4 divisors (see below), whose sum is σ = 12431568. Its totient is φ = 11395560.

The previous prime is 11913553. The next prime is 11913581. The reversal of 11913563 is 36531911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36531911 = 13 ⋅2810147.

It is a cyclic number.

It is not a de Polignac number, because 11913563 - 2¹² = 11909467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11913553) 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, 258968 + ... + 259013.

It is an arithmetic number, because the mean of its divisors is an integer number (3107892).

Almost surely, 2^11913563 is an apocalyptic number.

11913563 is a deficient number, since it is larger than the sum of its proper divisors (518005).

11913563 is an equidigital number, since it uses as much as digits as its factorization.

11913563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518004.

The product of its digits is 2430, while the sum is 29.

The square root of 11913563 is about 3451.6029609444. The cubic root of 11913563 is about 228.3918252242.

The spelling of 11913563 in words is "eleven million, nine hundred thirteen thousand, five hundred sixty-three".