1641089761 has 2 divisors, whose sum is σ = 1641089762. Its totient is φ = 1641089760.

The previous prime is 1641089719. The next prime is 1641089839. The reversal of 1641089761 is 1679801461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1138657536 + 502432225 = 33744^2 + 22415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641089761 - 2⁷ = 1641089633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641089701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820544880 + 820544881.

It is an arithmetic number, because the mean of its divisors is an integer number (820544881).

Almost surely, 2^1641089761 is an apocalyptic number.

It is an amenable number.

1641089761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641089761 is an equidigital number, since it uses as much as digits as its factorization.

1641089761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1641089761 is about 40510.3660931372. The cubic root of 1641089761 is about 1179.5348547318.

The spelling of 1641089761 in words is "one billion, six hundred forty-one million, eighty-nine thousand, seven hundred sixty-one".