19440097013 has 2 divisors, whose sum is σ = 19440097014. Its totient is φ = 19440097012.

The previous prime is 19440097009. The next prime is 19440097043. The reversal of 19440097013 is 31079004491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19347975409 + 92121604 = 139097^2 + 9598^2 .

It is a cyclic number.

It is not a de Polignac number, because 19440097013 - 2² = 19440097009 is a prime.

It is a super-3 number, since 3×19440097013³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19440097043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720048506 + 9720048507.

It is an arithmetic number, because the mean of its divisors is an integer number (9720048507).

Almost surely, 2^19440097013 is an apocalyptic number.

It is an amenable number.

19440097013 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440097013 is an equidigital number, since it uses as much as digits as its factorization.

19440097013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 19440097013 in words is "nineteen billion, four hundred forty million, ninety-seven thousand, thirteen".