1641755729 has 2 divisors, whose sum is σ = 1641755730. Its totient is φ = 1641755728.

The previous prime is 1641755701. The next prime is 1641755737. The reversal of 1641755729 is 9275571461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500787600 + 140968129 = 38740^2 + 11873^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641755729 - 2¹² = 1641751633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641755029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820877864 + 820877865.

It is an arithmetic number, because the mean of its divisors is an integer number (820877865).

Almost surely, 2^1641755729 is an apocalyptic number.

It is an amenable number.

1641755729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641755729 is an equidigital number, since it uses as much as digits as its factorization.

1641755729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 47.

The square root of 1641755729 is about 40518.5849826965. The cubic root of 1641755729 is about 1179.6943882020.

The spelling of 1641755729 in words is "one billion, six hundred forty-one million, seven hundred fifty-five thousand, seven hundred twenty-nine".