12109987 has 2 divisors, whose sum is σ = 12109988. Its totient is φ = 12109986.

The previous prime is 12109969. The next prime is 12109991. The reversal of 12109987 is 78990121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12109987 - 2¹¹ = 12107939 is a prime.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (12109687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6054993 + 6054994.

It is an arithmetic number, because the mean of its divisors is an integer number (6054994).

Almost surely, 2^12109987 is an apocalyptic number.

12109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109987 is an equidigital number, since it uses as much as digits as its factorization.

12109987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12109987 is about 3479.9406604136. The cubic root of 12109987 is about 229.6401872437.

The spelling of 12109987 in words is "twelve million, one hundred nine thousand, nine hundred eighty-seven".