1020203223517 has 2 divisors, whose sum is σ = 1020203223518. Its totient is φ = 1020203223516.

The previous prime is 1020203223503. The next prime is 1020203223527. The reversal of 1020203223517 is 7153223020201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607847885316 + 412355338201 = 779646^2 + 642149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020203223517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020203223527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510101611758 + 510101611759.

It is an arithmetic number, because the mean of its divisors is an integer number (510101611759).

Almost surely, 2^{1020203223517} is an apocalyptic number.

It is an amenable number.

1020203223517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020203223517 is an equidigital number, since it uses as much as digits as its factorization.

1020203223517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 1020203223517 its reverse (7153223020201), we get a palindrome (8173426243718).

The spelling of 1020203223517 in words is "one trillion, twenty billion, two hundred three million, two hundred twenty-three thousand, five hundred seventeen".