641608947 has 12 divisors (see below), whose sum is σ = 1059164080. Its totient is φ = 366633648.

The previous prime is 641608931. The next prime is 641608973. The reversal of 641608947 is 749806146.

It is not a de Polignac number, because 641608947 - 2⁴ = 641608931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641608987) 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 11 ways as a sum of consecutive naturals, for example, 5092072 + ... + 5092197.

Almost surely, 2^641608947 is an apocalyptic number.

641608947 is a deficient number, since it is larger than the sum of its proper divisors (417555133).

641608947 is a wasteful number, since it uses less digits than its factorization.

641608947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10184282 (or 10184279 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 641608947 is about 25330.0009277536. Note that the first 3 decimals coincide. The cubic root of 641608947 is about 862.4954323640.

The spelling of 641608947 in words is "six hundred forty-one million, six hundred eight thousand, nine hundred forty-seven".