509321123923 has 2 divisors, whose sum is σ = 509321123924. Its totient is φ = 509321123922.

The previous prime is 509321123867. The next prime is 509321123929. The reversal of 509321123923 is 329321123905.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509321123923 is a prime.

It is not a weakly prime, because it can be changed into another prime (509321123929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254660561961 + 254660561962.

It is an arithmetic number, because the mean of its divisors is an integer number (254660561962).

Almost surely, 2^509321123923 is an apocalyptic number.

509321123923 is a deficient number, since it is larger than the sum of its proper divisors (1).

509321123923 is an equidigital number, since it uses as much as digits as its factorization.

509321123923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 509321123923 in words is "five hundred nine billion, three hundred twenty-one million, one hundred twenty-three thousand, nine hundred twenty-three".