1643060191 has 2 divisors, whose sum is σ = 1643060192. Its totient is φ = 1643060190.

The previous prime is 1643060113. The next prime is 1643060257. The reversal of 1643060191 is 1910603461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1643060191 - 2¹⁵ = 1643027423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643060291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821530095 + 821530096.

It is an arithmetic number, because the mean of its divisors is an integer number (821530096).

Almost surely, 2^1643060191 is an apocalyptic number.

1643060191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643060191 is an equidigital number, since it uses as much as digits as its factorization.

1643060191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1643060191 is about 40534.6788688402. The cubic root of 1643060191 is about 1180.0067487405.

The spelling of 1643060191 in words is "one billion, six hundred forty-three million, sixty thousand, one hundred ninety-one".