2157671 has 2 divisors, whose sum is σ = 2157672. Its totient is φ = 2157670.

The previous prime is 2157667. The next prime is 2157677. The reversal of 2157671 is 1767512.

2157671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2157671 - 2² = 2157667 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078835 + 1078836.

It is an arithmetic number, because the mean of its divisors is an integer number (1078836).

2^2157671 is an apocalyptic number.

2157671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157671 is an equidigital number, since it uses as much as digits as its factorization.

2157671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 29.

The square root of 2157671 is about 1468.9012900804. The cubic root of 2157671 is about 129.2196047084.

The spelling of 2157671 in words is "two million, one hundred fifty-seven thousand, six hundred seventy-one".