1648805749 has 2 divisors, whose sum is σ = 1648805750. Its totient is φ = 1648805748.

The previous prime is 1648805621. The next prime is 1648805819. The reversal of 1648805749 is 9475088461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1632725649 + 16080100 = 40407^2 + 4010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648805749 - 2⁷ = 1648805621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1648805696 and 1648805705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648805149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824402874 + 824402875.

It is an arithmetic number, because the mean of its divisors is an integer number (824402875).

Almost surely, 2^1648805749 is an apocalyptic number.

It is an amenable number.

1648805749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648805749 is an equidigital number, since it uses as much as digits as its factorization.

1648805749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 1648805749 is about 40605.4891486360. The cubic root of 1648805749 is about 1181.3805896367.

The spelling of 1648805749 in words is "one billion, six hundred forty-eight million, eight hundred five thousand, seven hundred forty-nine".