313103520342521 has 2 divisors, whose sum is σ = 313103520342522. Its totient is φ = 313103520342520.

The previous prime is 313103520342479. The next prime is 313103520342551. The reversal of 313103520342521 is 125243025301313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309616576605625 + 3486943736896 = 17595925^2 + 1867336^2 .

It is an emirp because it is prime and its reverse (125243025301313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313103520342521 - 2³⁸ = 312828642435577 is a prime.

It is not a weakly prime, because it can be changed into another prime (313103520342551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156551760171260 + 156551760171261.

It is an arithmetic number, because the mean of its divisors is an integer number (156551760171261).

Almost surely, 2^{313103520342521} is an apocalyptic number.

It is an amenable number.

313103520342521 is a deficient number, since it is larger than the sum of its proper divisors (1).

313103520342521 is an equidigital number, since it uses as much as digits as its factorization.

313103520342521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 313103520342521 its reverse (125243025301313), we get a palindrome (438346545643834).

The spelling of 313103520342521 in words is "three hundred thirteen trillion, one hundred three billion, five hundred twenty million, three hundred forty-two thousand, five hundred twenty-one".