2161571 has 2 divisors, whose sum is σ = 2161572. Its totient is φ = 2161570.

The previous prime is 2161553. The next prime is 2161591. The reversal of 2161571 is 1751612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161571 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080785 + 1080786.

It is an arithmetic number, because the mean of its divisors is an integer number (1080786).

2^2161571 is an apocalyptic number.

2161571 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161571 is an equidigital number, since it uses as much as digits as its factorization.

2161571 is an evil number, because the sum of its binary digits is even.

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

The square root of 2161571 is about 1470.2282135777. The cubic root of 2161571 is about 129.2974128525.

The spelling of 2161571 in words is "two million, one hundred sixty-one thousand, five hundred seventy-one".