12291871 has 2 divisors, whose sum is σ = 12291872. Its totient is φ = 12291870.

The previous prime is 12291859. The next prime is 12291893. The reversal of 12291871 is 17819221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12291871 - 2¹⁵ = 12259103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12292871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145935 + 6145936.

It is an arithmetic number, because the mean of its divisors is an integer number (6145936).

Almost surely, 2^12291871 is an apocalyptic number.

12291871 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291871 is an equidigital number, since it uses as much as digits as its factorization.

12291871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 12291871 is about 3505.9764688315. The cubic root of 12291871 is about 230.7841602506.

The spelling of 12291871 in words is "twelve million, two hundred ninety-one thousand, eight hundred seventy-one".