521072243 has 2 divisors, whose sum is σ = 521072244. Its totient is φ = 521072242.

The previous prime is 521072213. The next prime is 521072297. The reversal of 521072243 is 342270125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521072243 - 2¹² = 521068147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (521072213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260536121 + 260536122.

It is an arithmetic number, because the mean of its divisors is an integer number (260536122).

Almost surely, 2^521072243 is an apocalyptic number.

521072243 is a deficient number, since it is larger than the sum of its proper divisors (1).

521072243 is an equidigital number, since it uses as much as digits as its factorization.

521072243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 521072243 is about 22827.0068778191. The cubic root of 521072243 is about 804.6974895644.

The spelling of 521072243 in words is "five hundred twenty-one million, seventy-two thousand, two hundred forty-three".