521444039 has 2 divisors, whose sum is σ = 521444040. Its totient is φ = 521444038.

The previous prime is 521443987. The next prime is 521444047. The reversal of 521444039 is 930444125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521444039 - 2¹² = 521439943 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 521443996 and 521444014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521444239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260722019 + 260722020.

It is an arithmetic number, because the mean of its divisors is an integer number (260722020).

Almost surely, 2^521444039 is an apocalyptic number.

521444039 is a deficient number, since it is larger than the sum of its proper divisors (1).

521444039 is an equidigital number, since it uses as much as digits as its factorization.

521444039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 521444039 is about 22835.1492003008. The cubic root of 521444039 is about 804.8888335876. Note that the first 4 decimals are identical.

The spelling of 521444039 in words is "five hundred twenty-one million, four hundred forty-four thousand, thirty-nine".