19897641481 has 9 divisors (see below), whose sum is σ = 20803762119. Its totient is φ = 19029423336.

The previous prime is 19897641479. The next prime is 19897641487. The reversal of 19897641481 is 18414679891.

The square root of 19897641481 is 141059.

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., 19266828025 + 630813456 = 138805^2 + 25116^2 .

It is not a de Polignac number, because 19897641481 - 2¹ = 19897641479 is a prime.

It is a super-3 number, since 3×19897641481³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19897641487) 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, 3241291 + ... + 3247423.

Almost surely, 2^19897641481 is an apocalyptic number.

19897641481 is the 141059-th square number.

19897641481 is the 70530-th centered octagonal number.

It is an amenable number.

19897641481 is a deficient number, since it is larger than the sum of its proper divisors (906120638).

19897641481 is an frugal number, since it uses more digits than its factorization.

19897641481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312 (or 6156 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 58.

The spelling of 19897641481 in words is "nineteen billion, eight hundred ninety-seven million, six hundred forty-one thousand, four hundred eighty-one".