641333305 has 8 divisors (see below), whose sum is σ = 775218312. Its totient is φ = 509321088.

The previous prime is 641333299. The next prime is 641333309. The reversal of 641333305 is 503333146.

It can be written as a sum of positive squares in 4 ways, for example, as 8156736 + 633176569 = 2856^2 + 25163^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 641333305 - 2¹⁹ = 640809017 is a prime.

It is a super-2 number, since 2×641333305² = 822616816204446050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641333309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467442 + ... + 468811.

It is an arithmetic number, because the mean of its divisors is an integer number (96902289).

Almost surely, 2^641333305 is an apocalyptic number.

It is an amenable number.

641333305 is a deficient number, since it is larger than the sum of its proper divisors (133885007).

641333305 is a wasteful number, since it uses less digits than its factorization.

641333305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936395.

The product of its (nonzero) digits is 9720, while the sum is 28.

The square root of 641333305 is about 25324.5593248925. The cubic root of 641333305 is about 862.3719022810.

The spelling of 641333305 in words is "six hundred forty-one million, three hundred thirty-three thousand, three hundred five".