513122231 has 4 divisors (see below), whose sum is σ = 513237072. Its totient is φ = 513007392.

The previous prime is 513122221. The next prime is 513122251. The reversal of 513122231 is 132221315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132221315 = 5 ⋅26444263.

It is a cyclic number.

It is not a de Polignac number, because 513122231 - 2¹⁸ = 512860087 is a prime.

It is a super-2 number, since 2×513122231² = 526588847892834722, 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 (513122221) 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, 50435 + ... + 59748.

It is an arithmetic number, because the mean of its divisors is an integer number (128309268).

Almost surely, 2^513122231 is an apocalyptic number.

513122231 is a deficient number, since it is larger than the sum of its proper divisors (114841).

513122231 is a wasteful number, since it uses less digits than its factorization.

513122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114840.

The product of its digits is 360, while the sum is 20.

The square root of 513122231 is about 22652.2014603438. The cubic root of 513122231 is about 800.5840687883.

Adding to 513122231 its reverse (132221315), we get a palindrome (645343546).

The spelling of 513122231 in words is "five hundred thirteen million, one hundred twenty-two thousand, two hundred thirty-one".