2101173691 has 4 divisors (see below), whose sum is σ = 2211761800. Its totient is φ = 1990585584.

The previous prime is 2101173689. The next prime is 2101173709. The reversal of 2101173691 is 1963711012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101173691 - 2¹ = 2101173689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101173601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55294026 + ... + 55294063.

It is an arithmetic number, because the mean of its divisors is an integer number (552940450).

Almost surely, 2^2101173691 is an apocalyptic number.

2101173691 is a deficient number, since it is larger than the sum of its proper divisors (110588109).

2101173691 is a wasteful number, since it uses less digits than its factorization.

2101173691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110588108.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 2101173691 is about 45838.5611794262. The cubic root of 2101173691 is about 1280.8176926570.

The spelling of 2101173691 in words is "two billion, one hundred one million, one hundred seventy-three thousand, six hundred ninety-one".