2169729689 has 2 divisors, whose sum is σ = 2169729690. Its totient is φ = 2169729688.

The previous prime is 2169729673. The next prime is 2169729697. The reversal of 2169729689 is 9869279612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1978737289 + 190992400 = 44483^2 + 13820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2169729689 - 2⁴ = 2169729673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2169929689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084864844 + 1084864845.

It is an arithmetic number, because the mean of its divisors is an integer number (1084864845).

Almost surely, 2^2169729689 is an apocalyptic number.

It is an amenable number.

2169729689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169729689 is an equidigital number, since it uses as much as digits as its factorization.

2169729689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 59.

The square root of 2169729689 is about 46580.3573301021. The cubic root of 2169729689 is about 1294.5988310304.

The spelling of 2169729689 in words is "two billion, one hundred sixty-nine million, seven hundred twenty-nine thousand, six hundred eighty-nine".