513131321551 has 2 divisors, whose sum is σ = 513131321552. Its totient is φ = 513131321550.

The previous prime is 513131321543. The next prime is 513131321561. The reversal of 513131321551 is 155123131315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513131321551 - 2³ = 513131321543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513131321531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256565660775 + 256565660776.

It is an arithmetic number, because the mean of its divisors is an integer number (256565660776).

Almost surely, 2^513131321551 is an apocalyptic number.

513131321551 is a deficient number, since it is larger than the sum of its proper divisors (1).

513131321551 is an equidigital number, since it uses as much as digits as its factorization.

513131321551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

Adding to 513131321551 its reverse (155123131315), we get a palindrome (668254452866).

The spelling of 513131321551 in words is "five hundred thirteen billion, one hundred thirty-one million, three hundred twenty-one thousand, five hundred fifty-one".