1641743591 has 2 divisors, whose sum is σ = 1641743592. Its totient is φ = 1641743590.

The previous prime is 1641743557. The next prime is 1641743629. The reversal of 1641743591 is 1953471461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641743591 - 2¹⁰ = 1641742567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641743491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820871795 + 820871796.

It is an arithmetic number, because the mean of its divisors is an integer number (820871796).

Almost surely, 2^1641743591 is an apocalyptic number.

1641743591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641743591 is an equidigital number, since it uses as much as digits as its factorization.

1641743591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 1641743591 is about 40518.4351993016. The cubic root of 1641743591 is about 1179.6914809149.

The spelling of 1641743591 in words is "one billion, six hundred forty-one million, seven hundred forty-three thousand, five hundred ninety-one".