646424091 has 16 divisors (see below), whose sum is σ = 960023200. Its totient is φ = 429888384.

The previous prime is 646424069. The next prime is 646424111. The reversal of 646424091 is 190424646.

646424091 is a `hidden beast` number, since 6 + 4 + 642 + 4 + 0 + 9 + 1 = 666.

646424091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646424091 - 2⁶ = 646424027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646424021) 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, 18226 + ... + 40311.

It is an arithmetic number, because the mean of its divisors is an integer number (60001450).

Almost surely, 2^646424091 is an apocalyptic number.

646424091 is a deficient number, since it is larger than the sum of its proper divisors (313599109).

646424091 is a wasteful number, since it uses less digits than its factorization.

646424091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58955 (or 58949 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 646424091 is about 25424.8715041001. The cubic root of 646424091 is about 864.6476745712.

The spelling of 646424091 in words is "six hundred forty-six million, four hundred twenty-four thousand, ninety-one".