2158769 has 2 divisors, whose sum is σ = 2158770. Its totient is φ = 2158768.

The previous prime is 2158763. The next prime is 2158771. The reversal of 2158769 is 9678512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 12544 = 1465^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158769 - 2⁴ = 2158753 is a prime.

It is a super-2 number, since 2×2158769² = 9320567190722, which contains 22 as substring.

Together with 2158771, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2158763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079384 + 1079385.

It is an arithmetic number, because the mean of its divisors is an integer number (1079385).

2^2158769 is an apocalyptic number.

It is an amenable number.

2158769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158769 is an equidigital number, since it uses as much as digits as its factorization.

2158769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 2158769 is about 1469.2749912797. The cubic root of 2158769 is about 129.2415201697.

The spelling of 2158769 in words is "two million, one hundred fifty-eight thousand, seven hundred sixty-nine".