641929907 has 4 divisors (see below), whose sum is σ = 657586776. Its totient is φ = 626273040.

The previous prime is 641929889. The next prime is 641929913. The reversal of 641929907 is 709929146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641929907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641929507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7828373 + ... + 7828454.

It is an arithmetic number, because the mean of its divisors is an integer number (164396694).

Almost surely, 2^641929907 is an apocalyptic number.

641929907 is a deficient number, since it is larger than the sum of its proper divisors (15656869).

641929907 is a wasteful number, since it uses less digits than its factorization.

641929907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15656868.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 641929907 is about 25336.3357058593. The cubic root of 641929907 is about 862.6392273178.

The spelling of 641929907 in words is "six hundred forty-one million, nine hundred twenty-nine thousand, nine hundred seven".