503306831081 has 2 divisors, whose sum is σ = 503306831082. Its totient is φ = 503306831080.

The previous prime is 503306831011. The next prime is 503306831113. The reversal of 503306831081 is 180138603305.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420800013481 + 82506817600 = 648691^2 + 287240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-503306831081 is a prime.

It is a super-2 number, since 2×503306831081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (503306831011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251653415540 + 251653415541.

It is an arithmetic number, because the mean of its divisors is an integer number (251653415541).

Almost surely, 2^503306831081 is an apocalyptic number.

It is an amenable number.

503306831081 is a deficient number, since it is larger than the sum of its proper divisors (1).

503306831081 is an equidigital number, since it uses as much as digits as its factorization.

503306831081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 503306831081 in words is "five hundred three billion, three hundred six million, eight hundred thirty-one thousand, eighty-one".