1213313111987 has 2 divisors, whose sum is σ = 1213313111988. Its totient is φ = 1213313111986.

The previous prime is 1213313111963. The next prime is 1213313112073. The reversal of 1213313111987 is 7891113133121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213313111987 - 2¹⁸ = 1213312849843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213312111987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606656555993 + 606656555994.

It is an arithmetic number, because the mean of its divisors is an integer number (606656555994).

Almost surely, 2^{1213313111987} is an apocalyptic number.

1213313111987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213313111987 is an equidigital number, since it uses as much as digits as its factorization.

1213313111987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The spelling of 1213313111987 in words is "one trillion, two hundred thirteen billion, three hundred thirteen million, one hundred eleven thousand, nine hundred eighty-seven".