1290212605909 has 2 divisors, whose sum is σ = 1290212605910. Its totient is φ = 1290212605908.

The previous prime is 1290212605789. The next prime is 1290212605921. The reversal of 1290212605909 is 9095062120921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218546638884 + 71665967025 = 1103878^2 + 267705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290212605909 - 2¹⁹ = 1290212081621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290212606909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645106302954 + 645106302955.

It is an arithmetic number, because the mean of its divisors is an integer number (645106302955).

Almost surely, 2^{1290212605909} is an apocalyptic number.

It is an amenable number.

1290212605909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290212605909 is an equidigital number, since it uses as much as digits as its factorization.

1290212605909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 1290212605909 in words is "one trillion, two hundred ninety billion, two hundred twelve million, six hundred five thousand, nine hundred nine".