43197881281 has 9 divisors (see below), whose sum is σ = 45595283841. Its totient is φ = 40920567444.

The previous prime is 43197881213. The next prime is 43197881291. The reversal of 43197881281 is 18218879134.

The square root of 43197881281 is 207841.

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

43197881281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43197881281 - 2²³ = 43189492673 is a prime.

It is a super-3 number, since 3×43197881281³ (a number of 33 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 (43197881201) 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, 3943510 + ... + 3954448.

It is an arithmetic number, because the mean of its divisors is an integer number (5066142649).

Almost surely, 2^43197881281 is an apocalyptic number.

43197881281 is the 207841-st square number.

43197881281 is the 103921-st centered octagonal number.

It is an amenable number.

43197881281 is a deficient number, since it is larger than the sum of its proper divisors (2397402560).

43197881281 is an frugal number, since it uses more digits than its factorization.

43197881281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21916 (or 10958 counting only the distinct ones).

The product of its digits is 774144, while the sum is 52.

The spelling of 43197881281 in words is "forty-three billion, one hundred ninety-seven million, eight hundred eighty-one thousand, two hundred eighty-one".