19317508549 has 2 divisors, whose sum is σ = 19317508550. Its totient is φ = 19317508548.

The previous prime is 19317508531. The next prime is 19317508591. The reversal of 19317508549 is 94580571391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14258031649 + 5059476900 = 119407^2 + 71130^2 .

It is a cyclic number.

It is not a de Polignac number, because 19317508549 - 2⁷ = 19317508421 is a prime.

It is a super-2 number, since 2×19317508549² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19317508496 and 19317508505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19317508519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9658754274 + 9658754275.

It is an arithmetic number, because the mean of its divisors is an integer number (9658754275).

Almost surely, 2^19317508549 is an apocalyptic number.

It is an amenable number.

19317508549 is a deficient number, since it is larger than the sum of its proper divisors (1).

19317508549 is an equidigital number, since it uses as much as digits as its factorization.

19317508549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 19317508549 in words is "nineteen billion, three hundred seventeen million, five hundred eight thousand, five hundred forty-nine".