13961561 has 4 divisors (see below), whose sum is σ = 14696400. Its totient is φ = 13226724.

The previous prime is 13961551. The next prime is 13961567. The reversal of 13961561 is 16516931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13961561 - 2¹⁰ = 13960537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13961567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367391 + ... + 367428.

It is an arithmetic number, because the mean of its divisors is an integer number (3674100).

Almost surely, 2^13961561 is an apocalyptic number.

It is an amenable number.

13961561 is a deficient number, since it is larger than the sum of its proper divisors (734839).

13961561 is an equidigital number, since it uses as much as digits as its factorization.

13961561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734838.

The product of its digits is 4860, while the sum is 32.

The square root of 13961561 is about 3736.5172286502. The cubic root of 13961561 is about 240.7934445683.

The spelling of 13961561 in words is "thirteen million, nine hundred sixty-one thousand, five hundred sixty-one".