641547617 has 2 divisors, whose sum is σ = 641547618. Its totient is φ = 641547616.

The previous prime is 641547607. The next prime is 641547707. The reversal of 641547617 is 716745146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555262096 + 86285521 = 23564^2 + 9289^2 .

It is a cyclic number.

It is not a de Polignac number, because 641547617 - 2¹⁰ = 641546593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641547607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320773808 + 320773809.

It is an arithmetic number, because the mean of its divisors is an integer number (320773809).

Almost surely, 2^641547617 is an apocalyptic number.

It is an amenable number.

641547617 is a deficient number, since it is larger than the sum of its proper divisors (1).

641547617 is an equidigital number, since it uses as much as digits as its factorization.

641547617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 641547617 is about 25328.7902790481. The cubic root of 641547617 is about 862.4679501358.

The spelling of 641547617 in words is "six hundred forty-one million, five hundred forty-seven thousand, six hundred seventeen".