18491424349 has 2 divisors, whose sum is σ = 18491424350. Its totient is φ = 18491424348.

The previous prime is 18491424317. The next prime is 18491424353. The reversal of 18491424349 is 94342419481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18487840900 + 3583449 = 135970^2 + 1893^2 .

It is a cyclic number.

It is not a de Polignac number, because 18491424349 - 2⁵ = 18491424317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18491424389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245712174 + 9245712175.

It is an arithmetic number, because the mean of its divisors is an integer number (9245712175).

Almost surely, 2^18491424349 is an apocalyptic number.

It is an amenable number.

18491424349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18491424349 is an equidigital number, since it uses as much as digits as its factorization.

18491424349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 49.

The spelling of 18491424349 in words is "eighteen billion, four hundred ninety-one million, four hundred twenty-four thousand, three hundred forty-nine".