2169351649 has 4 divisors (see below), whose sum is σ = 2177792964. Its totient is φ = 2160910336.

The previous prime is 2169351637. The next prime is 2169351659. The reversal of 2169351649 is 9461539612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2002115025 + 167236624 = 44745^2 + 12932^2 .

It is a cyclic number.

It is not a de Polignac number, because 2169351649 - 2¹¹ = 2169349601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2169351599 and 2169351608.

It is not an unprimeable number, because it can be changed into a prime (2169351659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4220272 + ... + 4220785.

It is an arithmetic number, because the mean of its divisors is an integer number (544448241).

Almost surely, 2^2169351649 is an apocalyptic number.

It is an amenable number.

2169351649 is a deficient number, since it is larger than the sum of its proper divisors (8441315).

2169351649 is an equidigital number, since it uses as much as digits as its factorization.

2169351649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8441314.

The product of its digits is 349920, while the sum is 46.

The square root of 2169351649 is about 46576.2992196675. The cubic root of 2169351649 is about 1294.5236390881.

The spelling of 2169351649 in words is "two billion, one hundred sixty-nine million, three hundred fifty-one thousand, six hundred forty-nine".