13801563 has 8 divisors (see below), whose sum is σ = 20446800. Its totient is φ = 9201024.

The previous prime is 13801561. The next prime is 13801573. The reversal of 13801563 is 36510831.

13801563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13801563 - 2¹ = 13801561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 511169 = 13801563 / (1 + 3 + 8 + 0 + 1 + 5 + 6 + 3).

It is not an unprimeable number, because it can be changed into a prime (13801561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255558 + ... + 255611.

It is an arithmetic number, because the mean of its divisors is an integer number (2555850).

Almost surely, 2^13801563 is an apocalyptic number.

13801563 is a deficient number, since it is larger than the sum of its proper divisors (6645237).

13801563 is an equidigital number, since it uses as much as digits as its factorization.

13801563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511178 (or 511172 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 13801563 is about 3715.0454909732. The cubic root of 13801563 is about 239.8700859391.

The spelling of 13801563 in words is "thirteen million, eight hundred one thousand, five hundred sixty-three".