203123823613 has 2 divisors, whose sum is σ = 203123823614. Its totient is φ = 203123823612.

The previous prime is 203123823599. The next prime is 203123823631. The reversal of 203123823613 is 316328321302.

Together with next prime (203123823631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137609837764 + 65513985849 = 370958^2 + 255957^2 .

It is a cyclic number.

It is not a de Polignac number, because 203123823613 - 2²¹ = 203121726461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203123823653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101561911806 + 101561911807.

It is an arithmetic number, because the mean of its divisors is an integer number (101561911807).

Almost surely, 2^203123823613 is an apocalyptic number.

It is an amenable number.

203123823613 is a deficient number, since it is larger than the sum of its proper divisors (1).

203123823613 is an equidigital number, since it uses as much as digits as its factorization.

203123823613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 203123823613 in words is "two hundred three billion, one hundred twenty-three million, eight hundred twenty-three thousand, six hundred thirteen".