1649744771 has 2 divisors, whose sum is σ = 1649744772. Its totient is φ = 1649744770.

The previous prime is 1649744741. The next prime is 1649744773. The reversal of 1649744771 is 1774479461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649744771 is a prime.

Together with 1649744773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1649744773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824872385 + 824872386.

It is an arithmetic number, because the mean of its divisors is an integer number (824872386).

Almost surely, 2^1649744771 is an apocalyptic number.

1649744771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649744771 is an equidigital number, since it uses as much as digits as its factorization.

1649744771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 50.

The square root of 1649744771 is about 40617.0502498643. The cubic root of 1649744771 is about 1181.6048189685.

The spelling of 1649744771 in words is "one billion, six hundred forty-nine million, seven hundred forty-four thousand, seven hundred seventy-one".