19440509941 has 2 divisors, whose sum is σ = 19440509942. Its totient is φ = 19440509940.

The previous prime is 19440509917. The next prime is 19440509947. The reversal of 19440509941 is 14990504491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13085072100 + 6355437841 = 114390^2 + 79721^2 .

It is a cyclic number.

It is not a de Polignac number, because 19440509941 - 2¹¹ = 19440507893 is a prime.

It is a super-2 number, since 2×19440509941² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19440509891 and 19440509900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19440509947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720254970 + 9720254971.

It is an arithmetic number, because the mean of its divisors is an integer number (9720254971).

Almost surely, 2^19440509941 is an apocalyptic number.

It is an amenable number.

19440509941 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440509941 is an equidigital number, since it uses as much as digits as its factorization.

19440509941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 19440509941 in words is "nineteen billion, four hundred forty million, five hundred nine thousand, nine hundred forty-one".