641544479 has 2 divisors, whose sum is σ = 641544480. Its totient is φ = 641544478.

The previous prime is 641544403. The next prime is 641544493. The reversal of 641544479 is 974445146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641544479 - 2²⁰ = 640495903 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641544499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320772239 + 320772240.

It is an arithmetic number, because the mean of its divisors is an integer number (320772240).

Almost surely, 2^641544479 is an apocalyptic number.

641544479 is a deficient number, since it is larger than the sum of its proper divisors (1).

641544479 is an equidigital number, since it uses as much as digits as its factorization.

641544479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 44.

The square root of 641544479 is about 25328.7283336531. The cubic root of 641544479 is about 862.4665439379.

The spelling of 641544479 in words is "six hundred forty-one million, five hundred forty-four thousand, four hundred seventy-nine".