1761648961 has 2 divisors, whose sum is σ = 1761648962. Its totient is φ = 1761648960.

The previous prime is 1761648949. The next prime is 1761648979. The reversal of 1761648961 is 1698461671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1667170561 + 94478400 = 40831^2 + 9720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1761648961 - 2¹⁷ = 1761517889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1761648901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 880824480 + 880824481.

It is an arithmetic number, because the mean of its divisors is an integer number (880824481).

Almost surely, 2^1761648961 is an apocalyptic number.

It is an amenable number.

1761648961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1761648961 is an equidigital number, since it uses as much as digits as its factorization.

1761648961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 1761648961 is about 41972.0021085485. The cubic root of 1761648961 is about 1207.7390927487.

The spelling of 1761648961 in words is "one billion, seven hundred sixty-one million, six hundred forty-eight thousand, nine hundred sixty-one".