643087 has 2 divisors, whose sum is σ = 643088. Its totient is φ = 643086.

The previous prime is 643081. The next prime is 643099. The reversal of 643087 is 780346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643087 - 2¹⁹ = 118799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321543 + 321544.

It is an arithmetic number, because the mean of its divisors is an integer number (321544).

2⁶⁴³⁰⁸⁷ is an apocalyptic number.

643087 is a deficient number, since it is larger than the sum of its proper divisors (1).

643087 is an equidigital number, since it uses as much as digits as its factorization.

643087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 643087 is about 801.9270540392. The cubic root of 643087 is about 86.3157225035.

The spelling of 643087 in words is "six hundred forty-three thousand, eighty-seven".