12051561171 has 32 divisors (see below), whose sum is σ = 18331645248. Its totient is φ = 6976696320.

The previous prime is 12051561143. The next prime is 12051561199. The reversal of 12051561171 is 17116515021.

It is an interprime number because it is at equal distance from previous prime (12051561143) and next prime (12051561199).

It is not a de Polignac number, because 12051561171 - 2⁶ = 12051561107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12051561101) 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, 2156601 + ... + 2162181.

It is an arithmetic number, because the mean of its divisors is an integer number (572863914).

Almost surely, 2^12051561171 is an apocalyptic number.

12051561171 is a deficient number, since it is larger than the sum of its proper divisors (6280084077).

12051561171 is a wasteful number, since it uses less digits than its factorization.

12051561171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8871.

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 12051561171 in words is "twelve billion, fifty-one million, five hundred sixty-one thousand, one hundred seventy-one".