1649444959 has 4 divisors (see below), whose sum is σ = 1680566616. Its totient is φ = 1618323304.

The previous prime is 1649444957. The next prime is 1649444963. The reversal of 1649444959 is 9594449461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9594449461 = 71 ⋅135133091.

It is a cyclic number.

It is not a de Polignac number, because 1649444959 - 2¹ = 1649444957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649444957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15560749 + ... + 15560854.

It is an arithmetic number, because the mean of its divisors is an integer number (420141654).

Almost surely, 2^1649444959 is an apocalyptic number.

1649444959 is a deficient number, since it is larger than the sum of its proper divisors (31121657).

1649444959 is an equidigital number, since it uses as much as digits as its factorization.

1649444959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31121656.

The product of its digits is 5598720, while the sum is 55.

The square root of 1649444959 is about 40613.3593661002. The cubic root of 1649444959 is about 1181.5332360238.

The spelling of 1649444959 in words is "one billion, six hundred forty-nine million, four hundred forty-four thousand, nine hundred fifty-nine".