521200087 has 2 divisors, whose sum is σ = 521200088. Its totient is φ = 521200086.

The previous prime is 521200081. The next prime is 521200129. The reversal of 521200087 is 780002125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521200087 - 2¹¹ = 521198039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521200081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260600043 + 260600044.

It is an arithmetic number, because the mean of its divisors is an integer number (260600044).

Almost surely, 2^521200087 is an apocalyptic number.

521200087 is a deficient number, since it is larger than the sum of its proper divisors (1).

521200087 is an equidigital number, since it uses as much as digits as its factorization.

521200087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 521200087 is about 22829.8069856055. The cubic root of 521200087 is about 804.7632944727.

The spelling of 521200087 in words is "five hundred twenty-one million, two hundred thousand, eighty-seven".