509245172923 has 4 divisors (see below), whose sum is σ = 509247960040. Its totient is φ = 509242385808.

The previous prime is 509245172881. The next prime is 509245172951. The reversal of 509245172923 is 329271542905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509245172923 is a prime.

It is a super-2 number, since 2×509245172923² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509245872923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1098690 + ... + 1491847.

It is an arithmetic number, because the mean of its divisors is an integer number (127311990010).

Almost surely, 2^509245172923 is an apocalyptic number.

509245172923 is a deficient number, since it is larger than the sum of its proper divisors (2787117).

509245172923 is a wasteful number, since it uses less digits than its factorization.

509245172923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787116.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 509245172923 in words is "five hundred nine billion, two hundred forty-five million, one hundred seventy-two thousand, nine hundred twenty-three".