398713148521 has 2 divisors, whose sum is σ = 398713148522. Its totient is φ = 398713148520.

The previous prime is 398713148473. The next prime is 398713148527. The reversal of 398713148521 is 125841317893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224102826025 + 174610322496 = 473395^2 + 417864^2 .

It is an emirp because it is prime and its reverse (125841317893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398713148521 is a prime.

It is not a weakly prime, because it can be changed into another prime (398713148527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199356574260 + 199356574261.

It is an arithmetic number, because the mean of its divisors is an integer number (199356574261).

Almost surely, 2^398713148521 is an apocalyptic number.

It is an amenable number.

398713148521 is a deficient number, since it is larger than the sum of its proper divisors (1).

398713148521 is an equidigital number, since it uses as much as digits as its factorization.

398713148521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The spelling of 398713148521 in words is "three hundred ninety-eight billion, seven hundred thirteen million, one hundred forty-eight thousand, five hundred twenty-one".