2156797289 has 2 divisors, whose sum is σ = 2156797290. Its totient is φ = 2156797288.

The previous prime is 2156797283. The next prime is 2156797297. The reversal of 2156797289 is 9827976512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1712304400 + 444492889 = 41380^2 + 21083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156797289 - 2¹² = 2156793193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156797283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078398644 + 1078398645.

It is an arithmetic number, because the mean of its divisors is an integer number (1078398645).

Almost surely, 2^2156797289 is an apocalyptic number.

It is an amenable number.

2156797289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156797289 is an equidigital number, since it uses as much as digits as its factorization.

2156797289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 2156797289 is about 46441.3316884863. The cubic root of 2156797289 is about 1292.0216061671.

The spelling of 2156797289 in words is "two billion, one hundred fifty-six million, seven hundred ninety-seven thousand, two hundred eighty-nine".