2171679 has 4 divisors (see below), whose sum is σ = 2895576. Its totient is φ = 1447784.

The previous prime is 2171657. The next prime is 2171707. The reversal of 2171679 is 9761712.

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 2171679 - 2⁷ = 2171551 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171639) 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, 361944 + ... + 361949.

It is an arithmetic number, because the mean of its divisors is an integer number (723894).

2^2171679 is an apocalyptic number.

2171679 is a deficient number, since it is larger than the sum of its proper divisors (723897).

2171679 is an equidigital number, since it uses as much as digits as its factorization.

2171679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723896.

The product of its digits is 5292, while the sum is 33.

The square root of 2171679 is about 1473.6617658065. The cubic root of 2171679 is about 129.4986409323.

Adding to 2171679 its sum of digits (33), we get a palindrome (2171712).

It can be divided in two parts, 2171 and 679, that added together give a triangular number (2850 = T₇₅).

The spelling of 2171679 in words is "two million, one hundred seventy-one thousand, six hundred seventy-nine".