13912561 has 4 divisors (see below), whose sum is σ = 14982772. Its totient is φ = 12842352.

The previous prime is 13912531. The next prime is 13912573. The reversal of 13912561 is 16521931.

13912561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16521931 = 3313 ⋅4987.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 13359025 = 744^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 13912561 - 2⁵ = 13912529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13912501) 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, 535086 + ... + 535111.

It is an arithmetic number, because the mean of its divisors is an integer number (3745693).

Almost surely, 2^13912561 is an apocalyptic number.

It is an amenable number.

13912561 is a deficient number, since it is larger than the sum of its proper divisors (1070211).

13912561 is a wasteful number, since it uses less digits than its factorization.

13912561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070210.

The product of its digits is 1620, while the sum is 28.

The square root of 13912561 is about 3729.9545573639. The cubic root of 13912561 is about 240.5114152399.

The spelling of 13912561 in words is "thirteen million, nine hundred twelve thousand, five hundred sixty-one".