19489761507841 has 9 divisors (see below), whose sum is σ = 19622105414121. Its totient is φ = 19358304360624.

The previous prime is 19489761507833. The next prime is 19489761507863. The reversal of 19489761507841 is 14870516798491.

The square root of 19489761507841 is 4414721.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 22958613441 + 19466802894400 = 151521^2 + 4412120^2 .

It is not a de Polignac number, because 19489761507841 - 2³ = 19489761507833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19489762507841) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 657778615 + ... + 657808243.

Almost surely, 2^{19489761507841} is an apocalyptic number.

19489761507841 is the 4414721-st square number.

19489761507841 is the 2207361-st centered octagonal number.

It is an amenable number.

19489761507841 is a deficient number, since it is larger than the sum of its proper divisors (132343906280).

19489761507841 is an frugal number, since it uses more digits than its factorization.

19489761507841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59556 (or 29778 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 70.

The spelling of 19489761507841 in words is "nineteen trillion, four hundred eighty-nine billion, seven hundred sixty-one million, five hundred seven thousand, eight hundred forty-one".