12711561 has 8 divisors (see below), whose sum is σ = 17023680. Its totient is φ = 8436912.

The previous prime is 12711553. The next prime is 12711577. The reversal of 12711561 is 16511721.

12711561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12711561 - 2³ = 12711553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12711161) 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, 8565 + ... + 9938.

It is an arithmetic number, because the mean of its divisors is an integer number (2127960).

Almost surely, 2^12711561 is an apocalyptic number.

It is an amenable number.

12711561 is a deficient number, since it is larger than the sum of its proper divisors (4312119).

12711561 is a wasteful number, since it uses less digits than its factorization.

12711561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18735.

The product of its digits is 420, while the sum is 24.

The square root of 12711561 is about 3565.3276146800. The cubic root of 12711561 is about 233.3814293145.

The spelling of 12711561 in words is "twelve million, seven hundred eleven thousand, five hundred sixty-one".