1648732649 has 2 divisors, whose sum is σ = 1648732650. Its totient is φ = 1648732648.

The previous prime is 1648732643. The next prime is 1648732699. The reversal of 1648732649 is 9462378461.

It is an a-pointer prime, because the next prime (1648732699) can be obtained adding 1648732649 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1586827225 + 61905424 = 39835^2 + 7868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648732649 - 2²⁴ = 1631955433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1648732597 and 1648732606.

It is not a weakly prime, because it can be changed into another prime (1648732643) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824366324 + 824366325.

It is an arithmetic number, because the mean of its divisors is an integer number (824366325).

Almost surely, 2^1648732649 is an apocalyptic number.

It is an amenable number.

1648732649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648732649 is an equidigital number, since it uses as much as digits as its factorization.

1648732649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 50.

The square root of 1648732649 is about 40604.5890140511. The cubic root of 1648732649 is about 1181.3631304954.

The spelling of 1648732649 in words is "one billion, six hundred forty-eight million, seven hundred thirty-two thousand, six hundred forty-nine".