1641305409 has 8 divisors (see below), whose sum is σ = 2317137120. Its totient is φ = 1029838656.

The previous prime is 1641305387. The next prime is 1641305423. The reversal of 1641305409 is 9045031461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1641305409 - 2²¹ = 1639208257 is a prime.

It is a super-2 number, since 2×1641305409² = 5387766891225314562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1641305409.

It is not an unprimeable number, because it can be changed into a prime (1641305429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16091179 + ... + 16091280.

It is an arithmetic number, because the mean of its divisors is an integer number (289642140).

Almost surely, 2^1641305409 is an apocalyptic number.

It is an amenable number.

1641305409 is a deficient number, since it is larger than the sum of its proper divisors (675831711).

1641305409 is a wasteful number, since it uses less digits than its factorization.

1641305409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32182479.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1641305409 is about 40513.0276454377. The cubic root of 1641305409 is about 1179.5865182052.

The spelling of 1641305409 in words is "one billion, six hundred forty-one million, three hundred five thousand, four hundred nine".