1212041009 has 2 divisors, whose sum is σ = 1212041010. Its totient is φ = 1212041008.

The previous prime is 1212040969. The next prime is 1212041011. The reversal of 1212041009 is 9001402121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821109025 + 390931984 = 28655^2 + 19772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212041009 is a prime.

Together with 1212041011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1212041209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606020504 + 606020505.

It is an arithmetic number, because the mean of its divisors is an integer number (606020505).

Almost surely, 2^1212041009 is an apocalyptic number.

It is an amenable number.

1212041009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212041009 is an equidigital number, since it uses as much as digits as its factorization.

1212041009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1212041009 is about 34814.3793424499. The cubic root of 1212041009 is about 1066.2010472448.

The spelling of 1212041009 in words is "one billion, two hundred twelve million, forty-one thousand, nine".