641749277 has 12 divisors (see below), whose sum is σ = 703299744. Its totient is φ = 585234000.

The previous prime is 641749271. The next prime is 641749279. The reversal of 641749277 is 772947146.

It is a happy number.

It is not a de Polignac number, because 641749277 - 2¹⁰ = 641748253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641749271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8849 + ... + 36902.

It is an arithmetic number, because the mean of its divisors is an integer number (58608312).

Almost surely, 2^641749277 is an apocalyptic number.

It is an amenable number.

641749277 is a deficient number, since it is larger than the sum of its proper divisors (61550467).

641749277 is a wasteful number, since it uses less digits than its factorization.

641749277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45860 (or 45847 counting only the distinct ones).

The product of its digits is 592704, while the sum is 47.

The square root of 641749277 is about 25332.7708117371. The cubic root of 641749277 is about 862.5583082334.

The spelling of 641749277 in words is "six hundred forty-one million, seven hundred forty-nine thousand, two hundred seventy-seven".