513923 has 2 divisors, whose sum is σ = 513924. Its totient is φ = 513922.

The previous prime is 513917. The next prime is 513937. The reversal of 513923 is 329315.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513923 - 2¹⁰ = 512899 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 513923.

It is not a weakly prime, because it can be changed into another prime (513943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256961 + 256962.

It is an arithmetic number, because the mean of its divisors is an integer number (256962).

2⁵¹³⁹²³ is an apocalyptic number.

513923 is a deficient number, since it is larger than the sum of its proper divisors (1).

513923 is an equidigital number, since it uses as much as digits as its factorization.

513923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 23.

The square root of 513923 is about 716.8842305421. The cubic root of 513923 is about 80.1000311201.

The spelling of 513923 in words is "five hundred thirteen thousand, nine hundred twenty-three".