19628487481 has 2 divisors, whose sum is σ = 19628487482. Its totient is φ = 19628487480.

The previous prime is 19628487469. The next prime is 19628487497. The reversal of 19628487481 is 18478482691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19628010000 + 477481 = 140100^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 19628487481 - 2⁵ = 19628487449 is a prime.

It is a super-2 number, since 2×19628487481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19628487421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9814243740 + 9814243741.

It is an arithmetic number, because the mean of its divisors is an integer number (9814243741).

Almost surely, 2^19628487481 is an apocalyptic number.

It is an amenable number.

19628487481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19628487481 is an equidigital number, since it uses as much as digits as its factorization.

19628487481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 58.

The spelling of 19628487481 in words is "nineteen billion, six hundred twenty-eight million, four hundred eighty-seven thousand, four hundred eighty-one".