1213948987 has 2 divisors, whose sum is σ = 1213948988. Its totient is φ = 1213948986.

The previous prime is 1213948973. The next prime is 1213948991. The reversal of 1213948987 is 7898493121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7898493121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213948987 - 2⁷ = 1213948859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213948907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606974493 + 606974494.

It is an arithmetic number, because the mean of its divisors is an integer number (606974494).

Almost surely, 2^1213948987 is an apocalyptic number.

1213948987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213948987 is an equidigital number, since it uses as much as digits as its factorization.

1213948987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 1213948987 is about 34841.7707213626. The cubic root of 1213948987 is about 1066.7602201908.

The spelling of 1213948987 in words is "one billion, two hundred thirteen million, nine hundred forty-eight thousand, nine hundred eighty-seven".