513501631 has 2 divisors, whose sum is σ = 513501632. Its totient is φ = 513501630.

The previous prime is 513501617. The next prime is 513501641. The reversal of 513501631 is 136105315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513501631 - 2¹¹ = 513499583 is a prime.

It is a super-2 number, since 2×513501631² = 527367850079320322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513501596 and 513501605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513501641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256750815 + 256750816.

It is an arithmetic number, because the mean of its divisors is an integer number (256750816).

Almost surely, 2^513501631 is an apocalyptic number.

513501631 is a deficient number, since it is larger than the sum of its proper divisors (1).

513501631 is an equidigital number, since it uses as much as digits as its factorization.

513501631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 513501631 is about 22660.5743748917. The cubic root of 513501631 is about 800.7813361231.

Adding to 513501631 its reverse (136105315), we get a palindrome (649606946).

The spelling of 513501631 in words is "five hundred thirteen million, five hundred one thousand, six hundred thirty-one".