641745 has 24 divisors (see below), whose sum is σ = 1199016. Its totient is φ = 315648.

The previous prime is 641713. The next prime is 641747. The reversal of 641745 is 547146.

641745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 144 + 641601 = 12^2 + 801^2 .

It is not a de Polignac number, because 641745 - 2⁵ = 641713 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (49959).

2⁶⁴¹⁷⁴⁵ is an apocalyptic number.

641745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

641745 is a deficient number, since it is larger than the sum of its proper divisors (557271).

641745 is a wasteful number, since it uses less digits than its factorization.

641745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1118 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 641745 is about 801.0898825975. The cubic root of 641745 is about 86.2556392028.

The spelling of 641745 in words is "six hundred forty-one thousand, seven hundred forty-five".