641634307 has 4 divisors (see below), whose sum is σ = 644858800. Its totient is φ = 638409816.

The previous prime is 641634283. The next prime is 641634317. The reversal of 641634307 is 703436146.

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-641634307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641634317) 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, 1611948 + ... + 1612345.

It is an arithmetic number, because the mean of its divisors is an integer number (161214700).

Almost surely, 2^641634307 is an apocalyptic number.

641634307 is a deficient number, since it is larger than the sum of its proper divisors (3224493).

641634307 is a wasteful number, since it uses less digits than its factorization.

641634307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224492.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 641634307 is about 25330.5015149720. The cubic root of 641634307 is about 862.5067957737.

The spelling of 641634307 in words is "six hundred forty-one million, six hundred thirty-four thousand, three hundred seven".