2131671 has 4 divisors (see below), whose sum is σ = 2842232. Its totient is φ = 1421112.

The previous prime is 2131669. The next prime is 2131687. The reversal of 2131671 is 1761312.

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

It is not a de Polignac number, because 2131671 - 2¹ = 2131669 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131601) 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, 355276 + ... + 355281.

It is an arithmetic number, because the mean of its divisors is an integer number (710558).

2^2131671 is an apocalyptic number.

2131671 is a deficient number, since it is larger than the sum of its proper divisors (710561).

2131671 is an equidigital number, since it uses as much as digits as its factorization.

2131671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710560.

The product of its digits is 252, while the sum is 21.

The square root of 2131671 is about 1460.0243148660. The cubic root of 2131671 is about 128.6984724841.

Adding to 2131671 its reverse (1761312), we get a palindrome (3892983).

The spelling of 2131671 in words is "two million, one hundred thirty-one thousand, six hundred seventy-one".