390063317521 has 2 divisors, whose sum is σ = 390063317522. Its totient is φ = 390063317520.

The previous prime is 390063317503. The next prime is 390063317591. The reversal of 390063317521 is 125713360093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268008113025 + 122055204496 = 517695^2 + 349364^2 .

It is a cyclic number.

It is not a de Polignac number, because 390063317521 - 2¹⁹ = 390062793233 is a prime.

It is not a weakly prime, because it can be changed into another prime (390063317591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195031658760 + 195031658761.

It is an arithmetic number, because the mean of its divisors is an integer number (195031658761).

Almost surely, 2^390063317521 is an apocalyptic number.

It is an amenable number.

390063317521 is a deficient number, since it is larger than the sum of its proper divisors (1).

390063317521 is an equidigital number, since it uses as much as digits as its factorization.

390063317521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 40.

The spelling of 390063317521 in words is "three hundred ninety billion, sixty-three million, three hundred seventeen thousand, five hundred twenty-one".