1001099999987 has 2 divisors, whose sum is σ = 1001099999988. Its totient is φ = 1001099999986.

The previous prime is 1001099999983. The next prime is 1001100000001. The reversal of 1001099999987 is 7899999901001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001099999987 - 2² = 1001099999983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001099999987.

It is not a weakly prime, because it can be changed into another prime (1001099999983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500549999993 + 500549999994.

It is an arithmetic number, because the mean of its divisors is an integer number (500549999994).

Almost surely, 2^{1001099999987} is an apocalyptic number.

1001099999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001099999987 is an equidigital number, since it uses as much as digits as its factorization.

1001099999987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29760696, while the sum is 71.

The spelling of 1001099999987 in words is "one trillion, one billion, ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".