1219457887 has 2 divisors, whose sum is σ = 1219457888. Its totient is φ = 1219457886.

The previous prime is 1219457851. The next prime is 1219457903. The reversal of 1219457887 is 7887549121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7887549121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219457887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219457807) 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, 609728943 + 609728944.

It is an arithmetic number, because the mean of its divisors is an integer number (609728944).

Almost surely, 2^1219457887 is an apocalyptic number.

1219457887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219457887 is an equidigital number, since it uses as much as digits as its factorization.

1219457887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 52.

The square root of 1219457887 is about 34920.7372058495. The cubic root of 1219457887 is about 1068.3714378870.

The spelling of 1219457887 in words is "one billion, two hundred nineteen million, four hundred fifty-seven thousand, eight hundred eighty-seven".