1520313517 has 2 divisors, whose sum is σ = 1520313518. Its totient is φ = 1520313516.

The previous prime is 1520313511. The next prime is 1520313527. The reversal of 1520313517 is 7153130251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1520142121 + 171396 = 38989^2 + 414^2 .

It is an emirp because it is prime and its reverse (7153130251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520313517 is a prime.

It is a super-2 number, since 2×1520313517² = 4622706379945818578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520313511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760156758 + 760156759.

It is an arithmetic number, because the mean of its divisors is an integer number (760156759).

Almost surely, 2^1520313517 is an apocalyptic number.

It is an amenable number.

1520313517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520313517 is an equidigital number, since it uses as much as digits as its factorization.

1520313517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 1520313517 is about 38991.1979426126. The cubic root of 1520313517 is about 1149.8584619758.

Adding to 1520313517 its reverse (7153130251), we get a palindrome (8673443768).

The spelling of 1520313517 in words is "one billion, five hundred twenty million, three hundred thirteen thousand, five hundred seventeen".