6247043921 has 2 divisors, whose sum is σ = 6247043922. Its totient is φ = 6247043920.

The previous prime is 6247043899. The next prime is 6247043947. The reversal of 6247043921 is 1293407426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6235313296 + 11730625 = 78964^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 6247043921 - 2¹⁸ = 6246781777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6247043981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3123521960 + 3123521961.

It is an arithmetic number, because the mean of its divisors is an integer number (3123521961).

Almost surely, 2^6247043921 is an apocalyptic number.

It is an amenable number.

6247043921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6247043921 is an equidigital number, since it uses as much as digits as its factorization.

6247043921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 6247043921 is about 79038.2434078592. The cubic root of 6247043921 is about 1841.7252958392.

The spelling of 6247043921 in words is "six billion, two hundred forty-seven million, forty-three thousand, nine hundred twenty-one".