513840073 has 2 divisors, whose sum is σ = 513840074. Its totient is φ = 513840072.

The previous prime is 513840013. The next prime is 513840121. The reversal of 513840073 is 370048315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513838224 + 1849 = 22668^2 + 43^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513840073 is a prime.

It is not a weakly prime, because it can be changed into another prime (513840013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256920036 + 256920037.

It is an arithmetic number, because the mean of its divisors is an integer number (256920037).

Almost surely, 2^513840073 is an apocalyptic number.

It is an amenable number.

513840073 is a deficient number, since it is larger than the sum of its proper divisors (1).

513840073 is an equidigital number, since it uses as much as digits as its factorization.

513840073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 513840073 is about 22668.0407843289. The cubic root of 513840073 is about 800.9572255464.

Adding to 513840073 its reverse (370048315), we get a palindrome (883888388).

The spelling of 513840073 in words is "five hundred thirteen million, eight hundred forty thousand, seventy-three".