641671747 has 4 divisors (see below), whose sum is σ = 641799736. Its totient is φ = 641543760.

The previous prime is 641671729. The next prime is 641671763. The reversal of 641671747 is 747176146.

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 641671747 - 2⁷ = 641671619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641671447) 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, 56154 + ... + 66607.

It is an arithmetic number, because the mean of its divisors is an integer number (160449934).

Almost surely, 2^641671747 is an apocalyptic number.

641671747 is a deficient number, since it is larger than the sum of its proper divisors (127989).

641671747 is a wasteful number, since it uses less digits than its factorization.

641671747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127988.

The product of its digits is 197568, while the sum is 43.

The square root of 641671747 is about 25331.2405341704. The cubic root of 641671747 is about 862.5235714905.

The spelling of 641671747 in words is "six hundred forty-one million, six hundred seventy-one thousand, seven hundred forty-seven".