2159669 has 2 divisors, whose sum is σ = 2159670. Its totient is φ = 2159668.

The previous prime is 2159639. The next prime is 2159671. The reversal of 2159669 is 9669512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 372100 = 1337^2 + 610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2159669 is a prime.

It is a super-2 number, since 2×2159669² = 9328340379122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2159671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079834 + 1079835.

It is an arithmetic number, because the mean of its divisors is an integer number (1079835).

2^2159669 is an apocalyptic number.

It is an amenable number.

2159669 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159669 is an equidigital number, since it uses as much as digits as its factorization.

2159669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 38.

The square root of 2159669 is about 1469.5812328687. The cubic root of 2159669 is about 129.2594781212.

The spelling of 2159669 in words is "two million, one hundred fifty-nine thousand, six hundred sixty-nine".