521223335987 has 2 divisors, whose sum is σ = 521223335988. Its totient is φ = 521223335986.

The previous prime is 521223335939. The next prime is 521223336079. The reversal of 521223335987 is 789533322125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521223335987 - 2¹² = 521223331891 is a prime.

It is not a weakly prime, because it can be changed into another prime (521223335387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260611667993 + 260611667994.

It is an arithmetic number, because the mean of its divisors is an integer number (260611667994).

Almost surely, 2^521223335987 is an apocalyptic number.

521223335987 is a deficient number, since it is larger than the sum of its proper divisors (1).

521223335987 is an equidigital number, since it uses as much as digits as its factorization.

521223335987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 50.

The spelling of 521223335987 in words is "five hundred twenty-one billion, two hundred twenty-three million, three hundred thirty-five thousand, nine hundred eighty-seven".