1609661969 has 32 divisors (see below), whose sum is σ = 1824768000. Its totient is φ = 1412541504.

The previous prime is 1609661959. The next prime is 1609662029. The reversal of 1609661969 is 9691669061.

It is not a de Polignac number, because 1609661969 - 2²⁴ = 1592884753 is a prime.

It is a super-2 number, since 2×1609661969² = 5182023308889913922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1609661969.

It is not an unprimeable number, because it can be changed into a prime (1609661959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2238392 + ... + 2239110.

It is an arithmetic number, because the mean of its divisors is an integer number (57024000).

Almost surely, 2^1609661969 is an apocalyptic number.

1609661969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1609661969 is a deficient number, since it is larger than the sum of its proper divisors (215106031).

1609661969 is a wasteful number, since it uses less digits than its factorization.

1609661969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 1609661969 is about 40120.5928296181. The cubic root of 1609661969 is about 1171.9566861592.

The spelling of 1609661969 in words is "one billion, six hundred nine million, six hundred sixty-one thousand, nine hundred sixty-nine".