1213663987 has 2 divisors, whose sum is σ = 1213663988. Its totient is φ = 1213663986.

The previous prime is 1213663967. The next prime is 1213664057. The reversal of 1213663987 is 7893663121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7893663121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213663987 - 2¹⁹ = 1213139699 is a prime.

It is a super-3 number, since 3×1213663987³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1213663937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606831993 + 606831994.

It is an arithmetic number, because the mean of its divisors is an integer number (606831994).

Almost surely, 2^1213663987 is an apocalyptic number.

1213663987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213663987 is an equidigital number, since it uses as much as digits as its factorization.

1213663987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 1213663987 is about 34837.6805628618. The cubic root of 1213663987 is about 1066.6767322075.

The spelling of 1213663987 in words is "one billion, two hundred thirteen million, six hundred sixty-three thousand, nine hundred eighty-seven".