1001219987 has 2 divisors, whose sum is σ = 1001219988. Its totient is φ = 1001219986.

The previous prime is 1001219977. The next prime is 1001220001. The reversal of 1001219987 is 7899121001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001219987 - 2⁴ = 1001219971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001219987.

It is not a weakly prime, because it can be changed into another prime (1001219917) 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, 500609993 + 500609994.

It is an arithmetic number, because the mean of its divisors is an integer number (500609994).

Almost surely, 2^1001219987 is an apocalyptic number.

1001219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001219987 is an equidigital number, since it uses as much as digits as its factorization.

1001219987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 1001219987 is about 31642.0604101566. The cubic root of 1001219987 is about 1000.4064970711.

The spelling of 1001219987 in words is "one billion, one million, two hundred nineteen thousand, nine hundred eighty-seven".