513631 has 2 divisors, whose sum is σ = 513632. Its totient is φ = 513630.

The previous prime is 513593. The next prime is 513641. The reversal of 513631 is 136315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513631 - 2¹¹ = 511583 is a prime.

It is a super-2 number, since 2×513631² = 527633608322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513599 and 513608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256815 + 256816.

It is an arithmetic number, because the mean of its divisors is an integer number (256816).

2⁵¹³⁶³¹ is an apocalyptic number.

513631 is a deficient number, since it is larger than the sum of its proper divisors (1).

513631 is an equidigital number, since it uses as much as digits as its factorization.

513631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 19.

The square root of 513631 is about 716.6805425013. The cubic root of 513631 is about 80.0848578741.

Adding to 513631 its reverse (136315), we get a palindrome (649946).

The spelling of 513631 in words is "five hundred thirteen thousand, six hundred thirty-one".