1649443847 has 2 divisors, whose sum is σ = 1649443848. Its totient is φ = 1649443846.

The previous prime is 1649443801. The next prime is 1649443871. The reversal of 1649443847 is 7483449461.

It is a strong prime.

It is an emirp because it is prime and its reverse (7483449461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649443847 - 2⁸ = 1649443591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1649443795 and 1649443804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649493847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824721923 + 824721924.

It is an arithmetic number, because the mean of its divisors is an integer number (824721924).

Almost surely, 2^1649443847 is an apocalyptic number.

1649443847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649443847 is an equidigital number, since it uses as much as digits as its factorization.

1649443847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 50.

The square root of 1649443847 is about 40613.3456760213. The cubic root of 1649443847 is about 1181.5329705072.

The spelling of 1649443847 in words is "one billion, six hundred forty-nine million, four hundred forty-three thousand, eight hundred forty-seven".