513123673 has 2 divisors, whose sum is σ = 513123674. Its totient is φ = 513123672.

The previous prime is 513123617. The next prime is 513123683. The reversal of 513123673 is 376321315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496041984 + 17081689 = 22272^2 + 4133^2 .

It is a cyclic number.

It is not a de Polignac number, because 513123673 - 2¹³ = 513115481 is a prime.

It is not a weakly prime, because it can be changed into another prime (513123613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256561836 + 256561837.

It is an arithmetic number, because the mean of its divisors is an integer number (256561837).

Almost surely, 2^513123673 is an apocalyptic number.

It is an amenable number.

513123673 is a deficient number, since it is larger than the sum of its proper divisors (1).

513123673 is an equidigital number, since it uses as much as digits as its factorization.

513123673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The square root of 513123673 is about 22652.2332894574. The cubic root of 513123673 is about 800.5848187338.

Adding to 513123673 its reverse (376321315), we get a palindrome (889444988).

The spelling of 513123673 in words is "five hundred thirteen million, one hundred twenty-three thousand, six hundred seventy-three".