641287 has 2 divisors, whose sum is σ = 641288. Its totient is φ = 641286.

The previous prime is 641279. The next prime is 641299. The reversal of 641287 is 782146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641287 - 2³ = 641279 is a prime.

It is a super-2 number, since 2×641287² = 822498032738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320643 + 320644.

It is an arithmetic number, because the mean of its divisors is an integer number (320644).

2⁶⁴¹²⁸⁷ is an apocalyptic number.

641287 is a deficient number, since it is larger than the sum of its proper divisors (1).

641287 is an equidigital number, since it uses as much as digits as its factorization.

641287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 641287 is about 800.8039710191. The cubic root of 641287 is about 86.2351147035.

The spelling of 641287 in words is "six hundred forty-one thousand, two hundred eighty-seven".