515301231 has 4 divisors (see below), whose sum is σ = 687068312. Its totient is φ = 343534152.

The previous prime is 515301197. The next prime is 515301239. The reversal of 515301231 is 132103515.

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

It is not a de Polignac number, because 515301231 - 2¹⁹ = 514776943 is a prime.

It is a super-2 number, since 2×515301231² = 531070717340230722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 515301198 and 515301207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515301239) 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, 85883536 + ... + 85883541.

It is an arithmetic number, because the mean of its divisors is an integer number (171767078).

Almost surely, 2^515301231 is an apocalyptic number.

515301231 is a deficient number, since it is larger than the sum of its proper divisors (171767081).

515301231 is a wasteful number, since it uses less digits than its factorization.

515301231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171767080.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 515301231 is about 22700.2473775067. The cubic root of 515301231 is about 801.7157089439.

Adding to 515301231 its reverse (132103515), we get a palindrome (647404746).

The spelling of 515301231 in words is "five hundred fifteen million, three hundred one thousand, two hundred thirty-one".