521438587 has 2 divisors, whose sum is σ = 521438588. Its totient is φ = 521438586.

The previous prime is 521438581. The next prime is 521438611. The reversal of 521438587 is 785834125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521438587 - 2²⁷ = 387220859 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (521438581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260719293 + 260719294.

It is an arithmetic number, because the mean of its divisors is an integer number (260719294).

Almost surely, 2^521438587 is an apocalyptic number.

521438587 is a deficient number, since it is larger than the sum of its proper divisors (1).

521438587 is an equidigital number, since it uses as much as digits as its factorization.

521438587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268800, while the sum is 43.

The square root of 521438587 is about 22835.0298226212. The cubic root of 521438587 is about 804.8860283846.

The spelling of 521438587 in words is "five hundred twenty-one million, four hundred thirty-eight thousand, five hundred eighty-seven".