513681319 has 4 divisors (see below), whose sum is σ = 514197544. Its totient is φ = 513165096.

The previous prime is 513681281. The next prime is 513681331. The reversal of 513681319 is 913186315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913186315 = 5 ⋅182637263.

It is a cyclic number.

It is not a de Polignac number, because 513681319 - 2⁹ = 513680807 is a prime.

It is a super-2 number, since 2×513681319² = 527736994979159522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513681019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256617 + ... + 258610.

It is an arithmetic number, because the mean of its divisors is an integer number (128549386).

Almost surely, 2^513681319 is an apocalyptic number.

513681319 is a deficient number, since it is larger than the sum of its proper divisors (516225).

513681319 is an equidigital number, since it uses as much as digits as its factorization.

513681319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516224.

The product of its digits is 19440, while the sum is 37.

The square root of 513681319 is about 22664.5387996315. The cubic root of 513681319 is about 800.8747301894.

The spelling of 513681319 in words is "five hundred thirteen million, six hundred eighty-one thousand, three hundred nineteen".