641545 has 8 divisors (see below), whose sum is σ = 794880. Its totient is φ = 496560.

The previous prime is 641521. The next prime is 641549. The reversal of 641545 is 545146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641545 - 2⁵ = 641513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1915 + ... + 2224.

It is an arithmetic number, because the mean of its divisors is an integer number (99360).

2⁶⁴¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

641545 is a deficient number, since it is larger than the sum of its proper divisors (153335).

641545 is a wasteful number, since it uses less digits than its factorization.

641545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175.

The product of its digits is 2400, while the sum is 25.

The square root of 641545 is about 800.9650429326. The cubic root of 641545 is about 86.2466777408.

The spelling of 641545 in words is "six hundred forty-one thousand, five hundred forty-five".