641247 has 16 divisors (see below), whose sum is σ = 902880. Its totient is φ = 404352.

The previous prime is 641239. The next prime is 641261. The reversal of 641247 is 742146.

It is not a de Polignac number, because 641247 - 2³ = 641239 is a prime.

It is a super-2 number, since 2×641247² = 822395430018, which contains 22 as substring.

641247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5829 + ... + 5937.

It is an arithmetic number, because the mean of its divisors is an integer number (56430).

2⁶⁴¹²⁴⁷ is an apocalyptic number.

641247 is the 654-th pentagonal number.

641247 is a deficient number, since it is larger than the sum of its proper divisors (261633).

641247 is a wasteful number, since it uses less digits than its factorization.

641247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202.

The product of its digits is 1344, while the sum is 24.

The square root of 641247 is about 800.7789957285. The cubic root of 641247 is about 86.2333217068.

It can be divided in two parts, 641 and 247, that added together give a palindrome (888).

The spelling of 641247 in words is "six hundred forty-one thousand, two hundred forty-seven".