12177561 has 12 divisors (see below), whose sum is σ = 17847536. Its totient is φ = 7380120.

The previous prime is 12177553. The next prime is 12177569. The reversal of 12177561 is 16577121.

12177561 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12177553) and next prime (12177569).

It is not a de Polignac number, because 12177561 - 2³ = 12177553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12177569) 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, 16411 + ... + 17136.

Almost surely, 2^12177561 is an apocalyptic number.

12177561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12177561 is a deficient number, since it is larger than the sum of its proper divisors (5669975).

12177561 is a wasteful number, since it uses less digits than its factorization.

12177561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33572 (or 33561 counting only the distinct ones).

The product of its digits is 2940, while the sum is 30.

The square root of 12177561 is about 3489.6362274598. The cubic root of 12177561 is about 230.0665276989.

It can be divided in two parts, 1217 and 7561, that added together give a palindrome (8778).

The spelling of 12177561 in words is "twelve million, one hundred seventy-seven thousand, five hundred sixty-one".