1212651642493 has 2 divisors, whose sum is σ = 1212651642494. Its totient is φ = 1212651642492.

The previous prime is 1212651642481. The next prime is 1212651642509. The reversal of 1212651642493 is 3942461562121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762944600089 + 449707042404 = 873467^2 + 670602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212651642493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212651642403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606325821246 + 606325821247.

It is an arithmetic number, because the mean of its divisors is an integer number (606325821247).

Almost surely, 2^{1212651642493} is an apocalyptic number.

It is an amenable number.

1212651642493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212651642493 is an equidigital number, since it uses as much as digits as its factorization.

1212651642493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The spelling of 1212651642493 in words is "one trillion, two hundred twelve billion, six hundred fifty-one million, six hundred forty-two thousand, four hundred ninety-three".