1990100117 has 2 divisors, whose sum is σ = 1990100118. Its totient is φ = 1990100116.

The previous prime is 1990100111. The next prime is 1990100159. The reversal of 1990100117 is 7110010991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1726070116 + 264030001 = 41546^2 + 16249^2 .

It is an emirp because it is prime and its reverse (7110010991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1990100117 - 2¹⁸ = 1989837973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990100117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990100111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995050058 + 995050059.

It is an arithmetic number, because the mean of its divisors is an integer number (995050059).

Almost surely, 2^1990100117 is an apocalyptic number.

It is an amenable number.

1990100117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990100117 is an equidigital number, since it uses as much as digits as its factorization.

1990100117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 1990100117 is about 44610.5381832589. The cubic root of 1990100117 is about 1257.8387652132.

The spelling of 1990100117 in words is "one billion, nine hundred ninety million, one hundred thousand, one hundred seventeen".