513215123 has 16 divisors (see below), whose sum is σ = 552205056. Its totient is φ = 475722720.

The previous prime is 513215107. The next prime is 513215161. The reversal of 513215123 is 321512315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 513215123 - 2⁴ = 513215107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513215173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239768 + ... + 241898.

It is an arithmetic number, because the mean of its divisors is an integer number (34512816).

Almost surely, 2^513215123 is an apocalyptic number.

513215123 is a deficient number, since it is larger than the sum of its proper divisors (38989933).

513215123 is a wasteful number, since it uses less digits than its factorization.

513215123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474.

The product of its digits is 900, while the sum is 23.

The square root of 513215123 is about 22654.2517642936. The cubic root of 513215123 is about 800.6323765557.

Adding to 513215123 its reverse (321512315), we get a palindrome (834727438).

The spelling of 513215123 in words is "five hundred thirteen million, two hundred fifteen thousand, one hundred twenty-three".