513493231 has 4 divisors (see below), whose sum is σ = 513978264. Its totient is φ = 513008200.

The previous prime is 513493171. The next prime is 513493247. The reversal of 513493231 is 132394315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132394315 = 5 ⋅26478863.

It is a cyclic number.

It is not a de Polignac number, because 513493231 - 2¹¹ = 513491183 is a prime.

It is a super-2 number, since 2×513493231² = 527350596565638722, 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 = 513493193 and 513493202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513493531) 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, 240925 + ... + 243046.

It is an arithmetic number, because the mean of its divisors is an integer number (128494566).

Almost surely, 2^513493231 is an apocalyptic number.

513493231 is a deficient number, since it is larger than the sum of its proper divisors (485033).

513493231 is a wasteful number, since it uses less digits than its factorization.

513493231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485032.

The product of its digits is 9720, while the sum is 31.

The square root of 513493231 is about 22660.3890301998. The cubic root of 513493231 is about 800.7769696326.

The spelling of 513493231 in words is "five hundred thirteen million, four hundred ninety-three thousand, two hundred thirty-one".