2170678729 has 2 divisors, whose sum is σ = 2170678730. Its totient is φ = 2170678728.

The previous prime is 2170678687. The next prime is 2170678799. The reversal of 2170678729 is 9278760712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1846678729 + 324000000 = 42973^2 + 18000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170678729 - 2¹⁷ = 2170547657 is a prime.

It is a super-2 number, since 2×2170678729² = 9423692289066110882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2170678799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085339364 + 1085339365.

It is an arithmetic number, because the mean of its divisors is an integer number (1085339365).

Almost surely, 2^2170678729 is an apocalyptic number.

It is an amenable number.

2170678729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170678729 is an equidigital number, since it uses as much as digits as its factorization.

2170678729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 2170678729 is about 46590.5433430433. The cubic root of 2170678729 is about 1294.7875560730.

The spelling of 2170678729 in words is "two billion, one hundred seventy million, six hundred seventy-eight thousand, seven hundred twenty-nine".