513223393 has 2 divisors, whose sum is σ = 513223394. Its totient is φ = 513223392.

The previous prime is 513223379. The next prime is 513223397. The reversal of 513223393 is 393322315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467078544 + 46144849 = 21612^2 + 6793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513223393 is a prime.

It is a super-2 number, since 2×513223393² = 526796502244864898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (513223397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256611696 + 256611697.

It is an arithmetic number, because the mean of its divisors is an integer number (256611697).

Almost surely, 2^513223393 is an apocalyptic number.

It is an amenable number.

513223393 is a deficient number, since it is larger than the sum of its proper divisors (1).

513223393 is an equidigital number, since it uses as much as digits as its factorization.

513223393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 31.

The square root of 513223393 is about 22654.4342900016. The cubic root of 513223393 is about 800.6366770227.

The spelling of 513223393 in words is "five hundred thirteen million, two hundred twenty-three thousand, three hundred ninety-three".