1213617563687 has 2 divisors, whose sum is σ = 1213617563688. Its totient is φ = 1213617563686.

The previous prime is 1213617563657. The next prime is 1213617563699. The reversal of 1213617563687 is 7863657163121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213617563687 - 2¹² = 1213617559591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213617563617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606808781843 + 606808781844.

It is an arithmetic number, because the mean of its divisors is an integer number (606808781844).

Almost surely, 2^{1213617563687} is an apocalyptic number.

1213617563687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213617563687 is an equidigital number, since it uses as much as digits as its factorization.

1213617563687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 56.

The spelling of 1213617563687 in words is "one trillion, two hundred thirteen billion, six hundred seventeen million, five hundred sixty-three thousand, six hundred eighty-seven".