12291287 has 2 divisors, whose sum is σ = 12291288. Its totient is φ = 12291286.

The previous prime is 12291277. The next prime is 12291313. The reversal of 12291287 is 78219221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12291287 - 2¹⁰ = 12290263 is a prime.

It is a super-2 number, since 2×12291287² = 302151472232738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12291277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145643 + 6145644.

It is an arithmetic number, because the mean of its divisors is an integer number (6145644).

Almost surely, 2^12291287 is an apocalyptic number.

12291287 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291287 is an equidigital number, since it uses as much as digits as its factorization.

12291287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 12291287 is about 3505.8931814874. The cubic root of 12291287 is about 230.7805052583.

The spelling of 12291287 in words is "twelve million, two hundred ninety-one thousand, two hundred eighty-seven".