999987101 has 2 divisors, whose sum is σ = 999987102. Its totient is φ = 999987100.

The previous prime is 999987097. The next prime is 999987103. The reversal of 999987101 is 101789999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523219876 + 476767225 = 22874^2 + 21835^2 .

It is a cyclic number.

It is not a de Polignac number, because 999987101 - 2² = 999987097 is a prime.

It is a Sophie Germain prime.

Together with 999987103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999987103) 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, 499993550 + 499993551.

It is an arithmetic number, because the mean of its divisors is an integer number (499993551).

Almost surely, 2^999987101 is an apocalyptic number.

It is an amenable number.

999987101 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987101 is an equidigital number, since it uses as much as digits as its factorization.

999987101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 999987101 is about 31622.5726499284. The cubic root of 999987101 is about 999.9957003148.

The spelling of 999987101 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, one hundred one".