19491660229 has 2 divisors, whose sum is σ = 19491660230. Its totient is φ = 19491660228.

The previous prime is 19491660217. The next prime is 19491660281. The reversal of 19491660229 is 92206619491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11747308225 + 7744352004 = 108385^2 + 88002^2 .

It is a cyclic number.

It is not a de Polignac number, because 19491660229 - 2¹¹ = 19491658181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19491664229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9745830114 + 9745830115.

It is an arithmetic number, because the mean of its divisors is an integer number (9745830115).

Almost surely, 2^19491660229 is an apocalyptic number.

It is an amenable number.

19491660229 is a deficient number, since it is larger than the sum of its proper divisors (1).

19491660229 is an equidigital number, since it uses as much as digits as its factorization.

19491660229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 19491660229 in words is "nineteen billion, four hundred ninety-one million, six hundred sixty thousand, two hundred twenty-nine".