521447 has 2 divisors, whose sum is σ = 521448. Its totient is φ = 521446.

The previous prime is 521429. The next prime is 521471. The reversal of 521447 is 744125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521447 - 2¹⁰ = 520423 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260723 + 260724.

It is an arithmetic number, because the mean of its divisors is an integer number (260724).

2⁵²¹⁴⁴⁷ is an apocalyptic number.

521447 is a deficient number, since it is larger than the sum of its proper divisors (1).

521447 is an equidigital number, since it uses as much as digits as its factorization.

521447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 23.

The square root of 521447 is about 722.1128720636. The cubic root of 521447 is about 80.4890357095.

The spelling of 521447 in words is "five hundred twenty-one thousand, four hundred forty-seven".