2171649673 has 4 divisors (see below), whose sum is σ = 2266069248. Its totient is φ = 2077230100.

The previous prime is 2171649671. The next prime is 2171649679. The reversal of 2171649673 is 3769461712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2171649673 - 2¹ = 2171649671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171649671) 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, 47209753 + ... + 47209798.

It is an arithmetic number, because the mean of its divisors is an integer number (566517312).

Almost surely, 2^2171649673 is an apocalyptic number.

2171649673 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2171649673 is a deficient number, since it is larger than the sum of its proper divisors (94419575).

2171649673 is an equidigital number, since it uses as much as digits as its factorization.

2171649673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94419574.

The product of its digits is 381024, while the sum is 46.

The square root of 2171649673 is about 46600.9621467197. The cubic root of 2171649673 is about 1294.9805800023.

The spelling of 2171649673 in words is "two billion, one hundred seventy-one million, six hundred forty-nine thousand, six hundred seventy-three".