19399101481 has 4 divisors (see below), whose sum is σ = 19399436500. Its totient is φ = 19398766464.

The previous prime is 19399101461. The next prime is 19399101563. The reversal of 19399101481 is 18410199391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18410199391 = 42967 ⋅428473.

It can be written as a sum of positive squares in 2 ways, for example, as 1474176025 + 17924925456 = 38395^2 + 133884^2 .

It is a cyclic number.

It is not a de Polignac number, because 19399101481 - 2²¹ = 19397004329 is a prime.

It is a super-2 number, since 2×19399101481² (a number of 21 digits) contains 22 as substring.

It is a deceptive number, since it divides R_19399101480.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19399101461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55836 + ... + 204733.

It is an arithmetic number, because the mean of its divisors is an integer number (4849859125).

Almost surely, 2^19399101481 is an apocalyptic number.

19399101481 is the 74449-th nonagonal number.

It is an amenable number.

19399101481 is a deficient number, since it is larger than the sum of its proper divisors (335019).

19399101481 is an equidigital number, since it uses as much as digits as its factorization.

19399101481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335018.

The product of its (nonzero) digits is 69984, while the sum is 46.

The spelling of 19399101481 in words is "nineteen billion, three hundred ninety-nine million, one hundred one thousand, four hundred eighty-one".