641547 has 8 divisors (see below), whose sum is σ = 950480. Its totient is φ = 427680.

The previous prime is 641521. The next prime is 641549. The reversal of 641547 is 745146.

It is not a de Polignac number, because 641547 - 2⁷ = 641419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23761 = 641547 / (6 + 4 + 1 + 5 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641547.

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, 11854 + ... + 11907.

It is an arithmetic number, because the mean of its divisors is an integer number (118810).

2⁶⁴¹⁵⁴⁷ is an apocalyptic number.

641547 is a deficient number, since it is larger than the sum of its proper divisors (308933).

641547 is a wasteful number, since it uses less digits than its factorization.

641547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23770 (or 23764 counting only the distinct ones).

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

The square root of 641547 is about 800.9662914256. The cubic root of 641547 is about 86.2467673647.

The spelling of 641547 in words is "six hundred forty-one thousand, five hundred forty-seven".