2190171905 has 16 divisors (see below), whose sum is σ = 2663834880. Its totient is φ = 1728425088.

The previous prime is 2190171899. The next prime is 2190171923. The reversal of 2190171905 is 5091710912.

It is a cyclic number.

It is not a de Polignac number, because 2190171905 - 2⁴ = 2190171889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690854 + ... + 694016.

It is an arithmetic number, because the mean of its divisors is an integer number (166489680).

Almost surely, 2^2190171905 is an apocalyptic number.

It is an amenable number.

2190171905 is a deficient number, since it is larger than the sum of its proper divisors (473662975).

2190171905 is a wasteful number, since it uses less digits than its factorization.

2190171905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000.

The product of its (nonzero) digits is 5670, while the sum is 35.

The square root of 2190171905 is about 46799.2724836615. The cubic root of 2190171905 is about 1298.6518380754.

The spelling of 2190171905 in words is "two billion, one hundred ninety million, one hundred seventy-one thousand, nine hundred five".