1648881749 has 2 divisors, whose sum is σ = 1648881750. Its totient is φ = 1648881748.

The previous prime is 1648881743. The next prime is 1648881761. The reversal of 1648881749 is 9471888461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1606566724 + 42315025 = 40082^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648881749 - 2²⁸ = 1380446293 is a prime.

It is a super-2 number, since 2×1648881749² = 5437622044370598002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1648881694 and 1648881703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648881743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824440874 + 824440875.

It is an arithmetic number, because the mean of its divisors is an integer number (824440875).

Almost surely, 2^1648881749 is an apocalyptic number.

It is an amenable number.

1648881749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648881749 is an equidigital number, since it uses as much as digits as its factorization.

1648881749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 56.

The square root of 1648881749 is about 40606.4249719179. The cubic root of 1648881749 is about 1181.3987408643.

The spelling of 1648881749 in words is "one billion, six hundred forty-eight million, eight hundred eighty-one thousand, seven hundred forty-nine".