515213 has 4 divisors (see below), whose sum is σ = 524988. Its totient is φ = 505440.

The previous prime is 515191. The next prime is 515227. The reversal of 515213 is 312515.

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 157609 + 357604 = 397^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 515213 - 2⁶ = 515149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 515191 and 515200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515233) 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, 4808 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (131247).

2⁵¹⁵²¹³ is an apocalyptic number.

515213 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

515213 is a deficient number, since it is larger than the sum of its proper divisors (9775).

515213 is an equidigital number, since it uses as much as digits as its factorization.

515213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9774.

The product of its digits is 150, while the sum is 17.

The square root of 515213 is about 717.7833935109. The cubic root of 515213 is about 80.1669949162.

Adding to 515213 its reverse (312515), we get a palindrome (827728).

The spelling of 515213 in words is "five hundred fifteen thousand, two hundred thirteen".