2161699 has 2 divisors, whose sum is σ = 2161700. Its totient is φ = 2161698.

The previous prime is 2161697. The next prime is 2161729. The reversal of 2161699 is 9961612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161699 - 2¹ = 2161697 is a prime.

Together with 2161697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2161697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080849 + 1080850.

It is an arithmetic number, because the mean of its divisors is an integer number (1080850).

2^2161699 is an apocalyptic number.

2161699 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161699 is an equidigital number, since it uses as much as digits as its factorization.

2161699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 2161699 is about 1470.2717435903. The cubic root of 2161699 is about 129.2999649689.

The spelling of 2161699 in words is "two million, one hundred sixty-one thousand, six hundred ninety-nine".