12137989 has 2 divisors, whose sum is σ = 12137990. Its totient is φ = 12137988.

The previous prime is 12137981. The next prime is 12138001. The reversal of 12137989 is 98973121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7935489 + 4202500 = 2817^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 12137989 - 2³ = 12137981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12137981) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6068994 + 6068995.

It is an arithmetic number, because the mean of its divisors is an integer number (6068995).

Almost surely, 2^12137989 is an apocalyptic number.

It is an amenable number.

12137989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12137989 is an equidigital number, since it uses as much as digits as its factorization.

12137989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 12137989 is about 3483.9616817640. The cubic root of 12137989 is about 229.8170504818.

The spelling of 12137989 in words is "twelve million, one hundred thirty-seven thousand, nine hundred eighty-nine".