1641797409 has 32 divisors (see below), whose sum is σ = 2526923520. Its totient is φ = 928795392.

The previous prime is 1641797393. The next prime is 1641797419. The reversal of 1641797409 is 9047971461.

It is not a de Polignac number, because 1641797409 - 2⁴ = 1641797393 is a prime.

It is a super-2 number, since 2×1641797409² = 5390997464398226562, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1641797419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946507 + ... + 948239.

It is an arithmetic number, because the mean of its divisors is an integer number (78966360).

Almost surely, 2^1641797409 is an apocalyptic number.

It is an amenable number.

1641797409 is a deficient number, since it is larger than the sum of its proper divisors (885126111).

1641797409 is a wasteful number, since it uses less digits than its factorization.

1641797409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1641797409 is about 40519.0993113124. The cubic root of 1641797409 is about 1179.7043712637.

The spelling of 1641797409 in words is "one billion, six hundred forty-one million, seven hundred ninety-seven thousand, four hundred nine".