513123305 has 4 divisors (see below), whose sum is σ = 615747972. Its totient is φ = 410498640.

The previous prime is 513123293. The next prime is 513123337. The reversal of 513123305 is 503321315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186923584 + 326199721 = 13672^2 + 18061^2 .

It is not a de Polignac number, because 513123305 - 2¹⁴ = 513106921 is a prime.

It is a super-2 number, since 2×513123305² = 526591052268246050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51312326 + ... + 51312335.

It is an arithmetic number, because the mean of its divisors is an integer number (153936993).

Almost surely, 2^513123305 is an apocalyptic number.

It is an amenable number.

513123305 is a deficient number, since it is larger than the sum of its proper divisors (102624667).

513123305 is a wasteful number, since it uses less digits than its factorization.

513123305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102624666.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 513123305 is about 22652.2251666365. The cubic root of 513123305 is about 800.5846273470.

The spelling of 513123305 in words is "five hundred thirteen million, one hundred twenty-three thousand, three hundred five".