13581963 has 12 divisors (see below), whose sum is σ = 20772648. Its totient is φ = 8521920.

The previous prime is 13581959. The next prime is 13581973. The reversal of 13581963 is 36918531.

It is a happy number.

13581963 is a `hidden beast` number, since 13 + 581 + 9 + 63 = 666.

It is not a de Polignac number, because 13581963 - 2² = 13581959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13581973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44233 + ... + 44538.

It is an arithmetic number, because the mean of its divisors is an integer number (1731054).

Almost surely, 2^13581963 is an apocalyptic number.

13581963 is a deficient number, since it is larger than the sum of its proper divisors (7190685).

13581963 is a wasteful number, since it uses less digits than its factorization.

13581963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88794 (or 88791 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 13581963 is about 3685.3714873809. The cubic root of 13581963 is about 238.5910678952.

It can be divided in two parts, 1358 and 1963, that added together give a triangular number (3321 = T₈₁).

The spelling of 13581963 in words is "thirteen million, five hundred eighty-one thousand, nine hundred sixty-three".