505023213509 has 2 divisors, whose sum is σ = 505023213510. Its totient is φ = 505023213508.

The previous prime is 505023213503. The next prime is 505023213551. The reversal of 505023213509 is 905312320505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330341011009 + 174682202500 = 574753^2 + 417950^2 .

It is a cyclic number.

It is not a de Polignac number, because 505023213509 - 2¹² = 505023209413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505023213503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252511606754 + 252511606755.

It is an arithmetic number, because the mean of its divisors is an integer number (252511606755).

Almost surely, 2^505023213509 is an apocalyptic number.

It is an amenable number.

505023213509 is a deficient number, since it is larger than the sum of its proper divisors (1).

505023213509 is an equidigital number, since it uses as much as digits as its factorization.

505023213509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40500, while the sum is 35.

The spelling of 505023213509 in words is "five hundred five billion, twenty-three million, two hundred thirteen thousand, five hundred nine".