19963293481 has 2 divisors, whose sum is σ = 19963293482. Its totient is φ = 19963293480.

The previous prime is 19963293461. The next prime is 19963293577. The reversal of 19963293481 is 18439236991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14299376400 + 5663917081 = 119580^2 + 75259^2 .

It is a cyclic number.

It is not a de Polignac number, because 19963293481 - 2¹³ = 19963285289 is a prime.

It is a super-2 number, since 2×19963293481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19963293431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9981646740 + 9981646741.

It is an arithmetic number, because the mean of its divisors is an integer number (9981646741).

Almost surely, 2^19963293481 is an apocalyptic number.

It is an amenable number.

19963293481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19963293481 is an equidigital number, since it uses as much as digits as its factorization.

19963293481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The spelling of 19963293481 in words is "nineteen billion, nine hundred sixty-three million, two hundred ninety-three thousand, four hundred eighty-one".