641305547 has 4 divisors (see below), whose sum is σ = 641629320. Its totient is φ = 640981776.

The previous prime is 641305531. The next prime is 641305601. The reversal of 641305547 is 745503146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641305547 - 2⁴ = 641305531 is a prime.

It is a super-2 number, since 2×641305547² = 822545609225938418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641305747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158897 + ... + 162882.

It is an arithmetic number, because the mean of its divisors is an integer number (160407330).

Almost surely, 2^641305547 is an apocalyptic number.

641305547 is a deficient number, since it is larger than the sum of its proper divisors (323773).

641305547 is a wasteful number, since it uses less digits than its factorization.

641305547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323772.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 641305547 is about 25324.0112738879. The cubic root of 641305547 is about 862.3594604590.

The spelling of 641305547 in words is "six hundred forty-one million, three hundred five thousand, five hundred forty-seven".