3309781621 has 16 divisors (see below), whose sum is σ = 3463225920. Its totient is φ = 3160529280.

The previous prime is 3309781613. The next prime is 3309781637. The reversal of 3309781621 is 1261879033.

It is not a de Polignac number, because 3309781621 - 2³ = 3309781613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3309781661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366466 + ... + 375388.

It is an arithmetic number, because the mean of its divisors is an integer number (216451620).

Almost surely, 2^3309781621 is an apocalyptic number.

It is an amenable number.

3309781621 is a deficient number, since it is larger than the sum of its proper divisors (153444299).

3309781621 is a wasteful number, since it uses less digits than its factorization.

3309781621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9156.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3309781621 is about 57530.7015514325. The cubic root of 3309781621 is about 1490.2751051269.

The spelling of 3309781621 in words is "three billion, three hundred nine million, seven hundred eighty-one thousand, six hundred twenty-one".