2644049921 has 2 divisors, whose sum is σ = 2644049922. Its totient is φ = 2644049920.

The previous prime is 2644049911. The next prime is 2644049977. The reversal of 2644049921 is 1299404462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1956823696 + 687226225 = 44236^2 + 26215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2644049921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2644049911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322024960 + 1322024961.

It is an arithmetic number, because the mean of its divisors is an integer number (1322024961).

It is a Proth number, since it is equal to 40345 ⋅ 2¹⁶ + 1 and 40345 < 2¹⁶.

Almost surely, 2^2644049921 is an apocalyptic number.

It is an amenable number.

2644049921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644049921 is an equidigital number, since it uses as much as digits as its factorization.

2644049921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 2644049921 is about 51420.3259519035. The cubic root of 2644049921 is about 1382.7910189633.

The spelling of 2644049921 in words is "two billion, six hundred forty-four million, forty-nine thousand, nine hundred twenty-one".