1000199987 has 2 divisors, whose sum is σ = 1000199988. Its totient is φ = 1000199986.

The previous prime is 1000199939. The next prime is 1000200001. The reversal of 1000199987 is 7899910001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000199987 - 2¹⁶ = 1000134451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000199927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500099993 + 500099994.

It is an arithmetic number, because the mean of its divisors is an integer number (500099994).

Almost surely, 2^1000199987 is an apocalyptic number.

1000199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000199987 is an equidigital number, since it uses as much as digits as its factorization.

1000199987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 1000199987 is about 31625.9385157184. The cubic root of 1000199987 is about 1000.0666578900.

The spelling of 1000199987 in words is "one billion, one hundred ninety-nine thousand, nine hundred eighty-seven".