12001139 has 2 divisors, whose sum is σ = 12001140. Its totient is φ = 12001138.

The previous prime is 12001117. The next prime is 12001153. The reversal of 12001139 is 93110021.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93110021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12001139 - 2⁸ = 12000883 is a prime.

It is not a weakly prime, because it can be changed into another prime (12001109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000569 + 6000570.

It is an arithmetic number, because the mean of its divisors is an integer number (6000570).

Almost surely, 2^12001139 is an apocalyptic number.

12001139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001139 is an equidigital number, since it uses as much as digits as its factorization.

12001139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 12001139 is about 3464.2660117260. The cubic root of 12001139 is about 228.9500917788.

The spelling of 12001139 in words is "twelve million, one thousand, one hundred thirty-nine".