19629484981 has 2 divisors, whose sum is σ = 19629484982. Its totient is φ = 19629484980.

The previous prime is 19629484967. The next prime is 19629485009. The reversal of 19629484981 is 18948492691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15591517956 + 4037967025 = 124866^2 + 63545^2 .

It is a cyclic number.

It is not a de Polignac number, because 19629484981 - 2¹¹ = 19629482933 is a prime.

It is a super-2 number, since 2×19629484981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19629454981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9814742490 + 9814742491.

It is an arithmetic number, because the mean of its divisors is an integer number (9814742491).

Almost surely, 2^19629484981 is an apocalyptic number.

It is an amenable number.

19629484981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19629484981 is an equidigital number, since it uses as much as digits as its factorization.

19629484981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 61.

The spelling of 19629484981 in words is "nineteen billion, six hundred twenty-nine million, four hundred eighty-four thousand, nine hundred eighty-one".