513221318 has 4 divisors (see below), whose sum is σ = 769831980. Its totient is φ = 256610658.

The previous prime is 513221257. The next prime is 513221321. The reversal of 513221318 is 813122315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 813122315 = 5 ⋅162624463.

It is a super-2 number, since 2×513221318² = 526792242499314248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128305328 + ... + 128305331.

It is an arithmetic number, because the mean of its divisors is an integer number (192457995).

Almost surely, 2^513221318 is an apocalyptic number.

513221318 is a deficient number, since it is larger than the sum of its proper divisors (256610662).

513221318 is a wasteful number, since it uses less digits than its factorization.

513221318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256610661.

The product of its digits is 1440, while the sum is 26.

The square root of 513221318 is about 22654.3884931816. The cubic root of 513221318 is about 800.6355980102.

The spelling of 513221318 in words is "five hundred thirteen million, two hundred twenty-one thousand, three hundred eighteen".