1213420552709 has 2 divisors, whose sum is σ = 1213420552710. Its totient is φ = 1213420552708.

The previous prime is 1213420552699. The next prime is 1213420552781. The reversal of 1213420552709 is 9072550243121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1126616662084 + 86803890625 = 1061422^2 + 294625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213420552709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213420152709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606710276354 + 606710276355.

It is an arithmetic number, because the mean of its divisors is an integer number (606710276355).

Almost surely, 2^{1213420552709} is an apocalyptic number.

It is an amenable number.

1213420552709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213420552709 is an equidigital number, since it uses as much as digits as its factorization.

1213420552709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 1213420552709 in words is "one trillion, two hundred thirteen billion, four hundred twenty million, five hundred fifty-two thousand, seven hundred nine".