18431050513 has 2 divisors, whose sum is σ = 18431050514. Its totient is φ = 18431050512.

The previous prime is 18431050507. The next prime is 18431050553. The reversal of 18431050513 is 31505013481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12230590464 + 6200460049 = 110592^2 + 78743^2 .

It is a cyclic number.

It is not a de Polignac number, because 18431050513 - 2²⁵ = 18397496081 is a prime.

It is not a weakly prime, because it can be changed into another prime (18431050553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215525256 + 9215525257.

It is an arithmetic number, because the mean of its divisors is an integer number (9215525257).

Almost surely, 2^18431050513 is an apocalyptic number.

It is an amenable number.

18431050513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18431050513 is an equidigital number, since it uses as much as digits as its factorization.

18431050513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 18431050513 its reverse (31505013481), we get a palindrome (49936063994).

The spelling of 18431050513 in words is "eighteen billion, four hundred thirty-one million, fifty thousand, five hundred thirteen".