12660291 has 24 divisors (see below), whose sum is σ = 22130784. Its totient is φ = 6808320.

The previous prime is 12660287. The next prime is 12660299. The reversal of 12660291 is 19206621.

12660291 = 159² + 160² + ... + 347².

It is not a de Polignac number, because 12660291 - 2² = 12660287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12660299) 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, 4840 + ... + 6981.

It is an arithmetic number, because the mean of its divisors is an integer number (922116).

Almost surely, 2^12660291 is an apocalyptic number.

12660291 is a deficient number, since it is larger than the sum of its proper divisors (9470493).

12660291 is a wasteful number, since it uses less digits than its factorization.

12660291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851 (or 11848 counting only the distinct ones).

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

The square root of 12660291 is about 3558.1302674298. The cubic root of 12660291 is about 233.0672379276.

The spelling of 12660291 in words is "twelve million, six hundred sixty thousand, two hundred ninety-one".