1641945791 has 2 divisors, whose sum is σ = 1641945792. Its totient is φ = 1641945790.

The previous prime is 1641945779. The next prime is 1641945797. The reversal of 1641945791 is 1975491461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641945791 - 2¹⁴ = 1641929407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641945797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820972895 + 820972896.

It is an arithmetic number, because the mean of its divisors is an integer number (820972896).

Almost surely, 2^1641945791 is an apocalyptic number.

1641945791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641945791 is an equidigital number, since it uses as much as digits as its factorization.

1641945791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1641945791 is about 40520.9302830031. The cubic root of 1641945791 is about 1179.7399098793.

The spelling of 1641945791 in words is "one billion, six hundred forty-one million, nine hundred forty-five thousand, seven hundred ninety-one".