641787147 has 12 divisors (see below), whose sum is σ = 967331664. Its totient is φ = 409255440.

The previous prime is 641787131. The next prime is 641787151. The reversal of 641787147 is 741787146.

It is not a de Polignac number, because 641787147 - 2⁴ = 641787131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641787647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1550004 + ... + 1550417.

It is an arithmetic number, because the mean of its divisors is an integer number (80610972).

Almost surely, 2^641787147 is an apocalyptic number.

641787147 is a deficient number, since it is larger than the sum of its proper divisors (325544517).

641787147 is a wasteful number, since it uses less digits than its factorization.

641787147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100450 (or 3100447 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 641787147 is about 25333.5182515181. The cubic root of 641787147 is about 862.5752745896.

Subtracting 641787147 from its reverse (741787146), we obtain a palindrome (99999999).

The spelling of 641787147 in words is "six hundred forty-one million, seven hundred eighty-seven thousand, one hundred forty-seven".