643160591 has 2 divisors, whose sum is σ = 643160592. Its totient is φ = 643160590.

The previous prime is 643160561. The next prime is 643160597. The reversal of 643160591 is 195061346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643160591 - 2¹⁸ = 642898447 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 (643160597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321580295 + 321580296.

It is an arithmetic number, because the mean of its divisors is an integer number (321580296).

Almost surely, 2^643160591 is an apocalyptic number.

643160591 is a deficient number, since it is larger than the sum of its proper divisors (1).

643160591 is an equidigital number, since it uses as much as digits as its factorization.

643160591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 643160591 is about 25360.6110139326. The cubic root of 643160591 is about 863.1901486161.

The spelling of 643160591 in words is "six hundred forty-three million, one hundred sixty thousand, five hundred ninety-one".