100001720087 has 2 divisors, whose sum is σ = 100001720088. Its totient is φ = 100001720086.

The previous prime is 100001720009. The next prime is 100001720099. The reversal of 100001720087 is 780027100001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100001720087 - 2²⁶ = 99934611223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001740087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000860043 + 50000860044.

It is an arithmetic number, because the mean of its divisors is an integer number (50000860044).

Almost surely, 2^100001720087 is an apocalyptic number.

100001720087 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001720087 is an equidigital number, since it uses as much as digits as its factorization.

100001720087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

Adding to 100001720087 its reverse (780027100001), we get a palindrome (880028820088).

The spelling of 100001720087 in words is "one hundred billion, one million, seven hundred twenty thousand, eighty-seven".