513223531 has 2 divisors, whose sum is σ = 513223532. Its totient is φ = 513223530.

The previous prime is 513223499. The next prime is 513223537. The reversal of 513223531 is 135322315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513223531 - 2⁵ = 513223499 is a prime.

It is a super-2 number, since 2×513223531² = 526796785544215922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513223496 and 513223505.

It is not a weakly prime, because it can be changed into another prime (513223537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256611765 + 256611766.

It is an arithmetic number, because the mean of its divisors is an integer number (256611766).

Almost surely, 2^513223531 is an apocalyptic number.

513223531 is a deficient number, since it is larger than the sum of its proper divisors (1).

513223531 is an equidigital number, since it uses as much as digits as its factorization.

513223531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 513223531 is about 22654.4373357627. The cubic root of 513223531 is about 800.6367487834.

Adding to 513223531 its reverse (135322315), we get a palindrome (648545846).

The spelling of 513223531 in words is "five hundred thirteen million, two hundred twenty-three thousand, five hundred thirty-one".