19848491497 has 2 divisors, whose sum is σ = 19848491498. Its totient is φ = 19848491496.

The previous prime is 19848491479. The next prime is 19848491521. The reversal of 19848491497 is 79419484891.

Together with previous prime (19848491479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17101054441 + 2747437056 = 130771^2 + 52416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19848491497 is a prime.

It is a super-2 number, since 2×19848491497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19848491477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9924245748 + 9924245749.

It is an arithmetic number, because the mean of its divisors is an integer number (9924245749).

Almost surely, 2^19848491497 is an apocalyptic number.

It is an amenable number.

19848491497 is a deficient number, since it is larger than the sum of its proper divisors (1).

19848491497 is an equidigital number, since it uses as much as digits as its factorization.

19848491497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 64.

The spelling of 19848491497 in words is "nineteen billion, eight hundred forty-eight million, four hundred ninety-one thousand, four hundred ninety-seven".