1209997806907 has 2 divisors, whose sum is σ = 1209997806908. Its totient is φ = 1209997806906.

The previous prime is 1209997806887. The next prime is 1209997806917. The reversal of 1209997806907 is 7096087999021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209997806907 - 2¹⁹ = 1209997282619 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209997806917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604998903453 + 604998903454.

It is an arithmetic number, because the mean of its divisors is an integer number (604998903454).

Almost surely, 2^{1209997806907} is an apocalyptic number.

1209997806907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209997806907 is an equidigital number, since it uses as much as digits as its factorization.

1209997806907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30862944, while the sum is 67.

The spelling of 1209997806907 in words is "one trillion, two hundred nine billion, nine hundred ninety-seven million, eight hundred six thousand, nine hundred seven".