1755648821 has 2 divisors, whose sum is σ = 1755648822. Its totient is φ = 1755648820.

The previous prime is 1755648809. The next prime is 1755648833. The reversal of 1755648821 is 1288465571.

It is a balanced prime because it is at equal distance from previous prime (1755648809) and next prime (1755648833).

It can be written as a sum of positive squares in only one way, i.e., 1746069796 + 9579025 = 41786^2 + 3095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1755648821 - 2⁶ = 1755648757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1755648841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877824410 + 877824411.

It is an arithmetic number, because the mean of its divisors is an integer number (877824411).

Almost surely, 2^1755648821 is an apocalyptic number.

It is an amenable number.

1755648821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1755648821 is an equidigital number, since it uses as much as digits as its factorization.

1755648821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 47.

The square root of 1755648821 is about 41900.4632551956. The cubic root of 1755648821 is about 1206.3663549210.

The spelling of 1755648821 in words is "one billion, seven hundred fifty-five million, six hundred forty-eight thousand, eight hundred twenty-one".