641608481 has 4 divisors (see below), whose sum is σ = 642093312. Its totient is φ = 641123652.

The previous prime is 641608447. The next prime is 641608493. The reversal of 641608481 is 184806146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641608481 - 2¹⁰ = 641607457 is a prime.

It is a super-2 number, since 2×641608481² = 823322885782254722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641608181) 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, 240425 + ... + 243078.

It is an arithmetic number, because the mean of its divisors is an integer number (160523328).

Almost surely, 2^641608481 is an apocalyptic number.

It is an amenable number.

641608481 is a deficient number, since it is larger than the sum of its proper divisors (484831).

641608481 is a wasteful number, since it uses less digits than its factorization.

641608481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484830.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 641608481 is about 25329.9917291735. The cubic root of 641608481 is about 862.4952235540.

The spelling of 641608481 in words is "six hundred forty-one million, six hundred eight thousand, four hundred eighty-one".