19371907489 has 9 divisors (see below), whose sum is σ = 21294771379. Its totient is φ = 17609433160.

The previous prime is 19371907469. The next prime is 19371907537. The reversal of 19371907489 is 98470917391.

The square root of 19371907489 is 139183.

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

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 19295432464 = 8745^2 + 138908^2 .

It is not a de Polignac number, because 19371907489 - 2¹³ = 19371899297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19371907459) 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, 1524687 + ... + 1537339.

Almost surely, 2^19371907489 is an apocalyptic number.

19371907489 is the 139183-rd square number.

19371907489 is the 69592-nd centered octagonal number.

It is an amenable number.

19371907489 is a deficient number, since it is larger than the sum of its proper divisors (1922863890).

19371907489 is an frugal number, since it uses more digits than its factorization.

19371907489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25328 (or 12664 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 58.

The spelling of 19371907489 in words is "nineteen billion, three hundred seventy-one million, nine hundred seven thousand, four hundred eighty-nine".