641744523 has 18 divisors (see below), whose sum is σ = 1078306164. Its totient is φ = 366710904.

The previous prime is 641744507. The next prime is 641744527. The reversal of 641744523 is 325447146.

641744523 is a `hidden beast` number, since 64 + 1 + 74 + 4 + 523 = 666.

It is not a de Polignac number, because 641744523 - 2⁴ = 641744507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641744527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 727161 + ... + 728042.

It is an arithmetic number, because the mean of its divisors is an integer number (59905898).

Almost surely, 2^641744523 is an apocalyptic number.

641744523 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

641744523 is a deficient number, since it is larger than the sum of its proper divisors (436561641).

641744523 is a wasteful number, since it uses less digits than its factorization.

641744523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455223 (or 1455213 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 641744523 is about 25332.6769805325. The cubic root of 641744523 is about 862.5561783194.

The spelling of 641744523 in words is "six hundred forty-one million, seven hundred forty-four thousand, five hundred twenty-three".