2151671 has 4 divisors (see below), whose sum is σ = 2188200. Its totient is φ = 2115144.

The previous prime is 2151659. The next prime is 2151683. The reversal of 2151671 is 1761512.

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

It is an interprime number because it is at equal distance from previous prime (2151659) and next prime (2151683).

It is a cyclic number.

It is not a de Polignac number, because 2151671 - 2⁶ = 2151607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151271) 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, 18176 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (547050).

2^2151671 is an apocalyptic number.

2151671 is a deficient number, since it is larger than the sum of its proper divisors (36529).

2151671 is an equidigital number, since it uses as much as digits as its factorization.

2151671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36528.

The product of its digits is 420, while the sum is 23.

The square root of 2151671 is about 1466.8575254605. The cubic root of 2151671 is about 129.0997165818.

The spelling of 2151671 in words is "two million, one hundred fifty-one thousand, six hundred seventy-one".