19491948841 has 2 divisors, whose sum is σ = 19491948842. Its totient is φ = 19491948840.

The previous prime is 19491948809. The next prime is 19491948869. The reversal of 19491948841 is 14884919491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10940323216 + 8551625625 = 104596^2 + 92475^2 .

It is a cyclic number.

It is not a de Polignac number, because 19491948841 - 2⁵ = 19491948809 is a prime.

It is a super-2 number, since 2×19491948841² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19491948341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9745974420 + 9745974421.

It is an arithmetic number, because the mean of its divisors is an integer number (9745974421).

Almost surely, 2^19491948841 is an apocalyptic number.

It is an amenable number.

19491948841 is a deficient number, since it is larger than the sum of its proper divisors (1).

19491948841 is an equidigital number, since it uses as much as digits as its factorization.

19491948841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 58.

The spelling of 19491948841 in words is "nineteen billion, four hundred ninety-one million, nine hundred forty-eight thousand, eight hundred forty-one".