1641742591 has 2 divisors, whose sum is σ = 1641742592. Its totient is φ = 1641742590.

The previous prime is 1641742567. The next prime is 1641742723. The reversal of 1641742591 is 1952471461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641742591 - 2⁵ = 1641742559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641742511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820871295 + 820871296.

It is an arithmetic number, because the mean of its divisors is an integer number (820871296).

Almost surely, 2^1641742591 is an apocalyptic number.

1641742591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641742591 is an equidigital number, since it uses as much as digits as its factorization.

1641742591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 1641742591 is about 40518.4228592377. The cubic root of 1641742591 is about 1179.6912413949.

The spelling of 1641742591 in words is "one billion, six hundred forty-one million, seven hundred forty-two thousand, five hundred ninety-one".