13980561 has 32 divisors (see below), whose sum is σ = 23055360. Its totient is φ = 7356096.

The previous prime is 13980559. The next prime is 13980583. The reversal of 13980561 is 16508931.

13980561 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 13980561 - 2¹ = 13980559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13980361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14290 + ... + 15236.

It is an arithmetic number, because the mean of its divisors is an integer number (720480).

Almost surely, 2^13980561 is an apocalyptic number.

It is an amenable number.

13980561 is a deficient number, since it is larger than the sum of its proper divisors (9074799).

13980561 is a wasteful number, since it uses less digits than its factorization.

13980561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 13980561 is about 3739.0588387989. The cubic root of 13980561 is about 240.9026253311.

It can be divided in two parts, 13980 and 561, that multiplied together give a triangular number (7842780 = T₃₉₆₀).

The spelling of 13980561 in words is "thirteen million, nine hundred eighty thousand, five hundred sixty-one".