2156659 has 2 divisors, whose sum is σ = 2156660. Its totient is φ = 2156658.

The previous prime is 2156647. The next prime is 2156669. The reversal of 2156659 is 9566512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156659 - 2¹¹ = 2154611 is a prime.

2156659 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2156629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078329 + 1078330.

It is an arithmetic number, because the mean of its divisors is an integer number (1078330).

2^2156659 is an apocalyptic number.

2156659 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156659 is an equidigital number, since it uses as much as digits as its factorization.

2156659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 2156659 is about 1468.5567745239. The cubic root of 2156659 is about 129.1993991735.

The spelling of 2156659 in words is "two million, one hundred fifty-six thousand, six hundred fifty-nine".