641765459 has 2 divisors, whose sum is σ = 641765460. Its totient is φ = 641765458.

The previous prime is 641765431. The next prime is 641765473. The reversal of 641765459 is 954567146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641765459 - 2¹² = 641761363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641765659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320882729 + 320882730.

It is an arithmetic number, because the mean of its divisors is an integer number (320882730).

Almost surely, 2^641765459 is an apocalyptic number.

641765459 is a deficient number, since it is larger than the sum of its proper divisors (1).

641765459 is an equidigital number, since it uses as much as digits as its factorization.

641765459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 641765459 is about 25333.0901983947. The cubic root of 641765459 is about 862.5655581058.

The spelling of 641765459 in words is "six hundred forty-one million, seven hundred sixty-five thousand, four hundred fifty-nine".