12961143 has 24 divisors (see below), whose sum is σ = 20599488. Its totient is φ = 7803072.

The previous prime is 12961141. The next prime is 12961147. The reversal of 12961143 is 34116921.

12961143 is a `hidden beast` number, since 1 + 2 + 9 + 611 + 43 = 666.

It is not a de Polignac number, because 12961143 - 2¹ = 12961141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4321 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (858312).

Almost surely, 2^12961143 is an apocalyptic number.

12961143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12961143 is a deficient number, since it is larger than the sum of its proper divisors (7638345).

12961143 is a wasteful number, since it uses less digits than its factorization.

12961143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423 (or 2420 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 12961143 is about 3600.1587464999. The cubic root of 12961143 is about 234.8989636587.

The spelling of 12961143 in words is "twelve million, nine hundred sixty-one thousand, one hundred forty-three".