5644947521 has 2 divisors, whose sum is σ = 5644947522. Its totient is φ = 5644947520.

The previous prime is 5644947493. The next prime is 5644947551. The reversal of 5644947521 is 1257494465.

5644947521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2944690225 + 2700257296 = 54265^2 + 51964^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644947521 - 2¹⁴ = 5644931137 is a prime.

It is not a weakly prime, because it can be changed into another prime (5644947551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822473760 + 2822473761.

It is an arithmetic number, because the mean of its divisors is an integer number (2822473761).

Almost surely, 2^5644947521 is an apocalyptic number.

It is an amenable number.

5644947521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5644947521 is an equidigital number, since it uses as much as digits as its factorization.

5644947521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 47.

The square root of 5644947521 is about 75132.8657845553. The cubic root of 5644947521 is about 1780.5464299951.

The spelling of 5644947521 in words is "five billion, six hundred forty-four million, nine hundred forty-seven thousand, five hundred twenty-one".