2171657 has 2 divisors, whose sum is σ = 2171658. Its totient is φ = 2171656.

The previous prime is 2171639. The next prime is 2171707. The reversal of 2171657 is 7561712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2062096 + 109561 = 1436^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171657 - 2⁶ = 2171593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2171627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085828 + 1085829.

It is an arithmetic number, because the mean of its divisors is an integer number (1085829).

2^2171657 is an apocalyptic number.

It is an amenable number.

2171657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171657 is an equidigital number, since it uses as much as digits as its factorization.

2171657 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 2171657 is about 1473.6543013882. The cubic root of 2171657 is about 129.4982036393.

The spelling of 2171657 in words is "two million, one hundred seventy-one thousand, six hundred fifty-seven".